Allows the initiator to use a variety of IQNs rather than just the
system IQN when creating iSCSI pools.
* docs/schemas/storagepool.rng: extends the syntax with <iqn name="..."/>
* src/conf/storage_conf.[ch]: read and stores the iqn name
* src/storage/storage_backend_iscsi.[ch]: implement the IQN selection
  when detected

Previously the uid/gid/mode in the xml was ignored when creating new
storage pool directories. This commit attempts to honor the requested
permissions, and spits out an error if it can't.

Note that when creating the directory, the rest of the path leading up
to the final element is created using current uid/gid/mode, and the
final element gets the settings from xml. It is NOT an error for the
directory to already exist; in this case, the perms for the existing
directory are just set (if necessary).

* src/storage/storage_backend_fs.c: update the virStorageBackendFileSystemBuild
  function to check the directory hierarchy separately then create the
  leaf directory with the right attributes

In order to avoid problems trying to chown files that were created by
root on a root-squashing nfs server, fork a new process that setuid's
to the desired uid before creating the file. (It's only done this way
if the pool containing the new volume is of type 'netfs', otherwise
the old method of creating the file followed by chown() is used.)

This changes the semantics of the "create_func" slightly - previously
it was assumed that this function just created the file, then the
caller would chown it to the desired uid. Now, create_func does both
operations.

There are multiple functions that can take on the role of create_func:

createFileDir - previously called mkdir(), now calls virDirCreate().
virStorageBackendCreateRaw - previously called open(),
                             now calls virFileCreate().
virStorageBackendCreateQemuImg - use virRunWithHook() to setuid/gid.
virStorageBackendCreateQcowCreate - same.
virStorageBackendCreateBlockFrom - preserve old behavior (but attempt
                                   chown when necessary even if not root)

* src/storage/storage_backend.[ch] src/storage/storage_backend_disk.c
  src/storage/storage_backend_fs.c src/storage/storage_backend_logical.c
  src/storage/storage_driver.c: change the create_func implementations,
  also propagate the pool information to be able to detect NETFS ones.

* src/storage/storage_backend_fs.c (virStorageBackendFileSystemRefresh):
Correct parentheses.  The documented intent is to ignore non-regular
files, yet due to a parenthesization error all errors were handled
that way.

* src/storage/storage_backend.h: Include <stdint.h>.

This patch removes the call to vol update after the volume build completes.
The update call is currently meaningless anyway because the vol build is passed
a copy of the definition, so the update result is thrown away.  More
importantly, if the user specified a selinux label for the volume, the update
call results in a double free of the label
* src/storage/storage_backend_fs.c: remove the update call

* src/storage/storage_driver.c: Fix IsPersistent() and IsActivE()
  methods on storage pools to use 'storagePrivateData' instead
  of 'privateData'. Also fix naming convention of objects

* src/storage/storage_backend_fs.c: virStorageBackendFileSystemDelete
  was incorrectly calling unlink() in an attempt to remove a directory.
  It should be calling rmdir() instead.

Replace free(virBufferContentAndReset()) with virBufferFreeAndReset().
Update documentation and replace all remaining calls to free() with
calls to VIR_FREE(). Also add missing calls to virBufferFreeAndReset()
and virReportOOMError() in OOM error cases.

This implements the virConnectIsSecure, virConnectIsEncrypted,
virDomainIsPersistent, virDomainIsActive, virNetworkIsActive,
virNetworkIsPersistent, virStoragePoolIsActive,
virStoragePoolIsPersistent, virInterfaceIsActive APIs in
(nearly) all drivers. Exceptions are:

 phyp: missing domainIsActive/Persistent
 esx: missing domainIsPersistent
 opennebula: missing domainIsActive/Persistent

* src/remote/remote_protocol.x: Define remote wire ABI for newly
  added APIs.
* daemon/remote_dispatch*.h: Re-generated from remote_protocol.x
* src/esx/esx_driver.c, src/lxc/lxc_driver.c, src/network/bridge_driver.c,
  src/opennebula/one_driver.c, src/openvz/openvz_conf.c,
  src/openvz/openvz_driver.c, src/phyp/phyp_driver.c,
  src/remote/remote_driver.c, src/storage/storage_driver.c,
  src/test/test_driver.c, src/uml/uml_driver.c, src/vbox/vbox_tmpl.c,
  src/xen/xen_driver.c, src/xen/xen_driver.h, src/xen/xen_inotify.c,
  src/xen/xen_inotify.h: Implement all the new APIs where possible

* src/libvirt.c src/lxc/lxc_conf.c src/lxc/lxc_container.c
  src/lxc/lxc_controller.c src/node_device/node_device_hal.c
  src/openvz/openvz_conf.c src/qemu/qemu_driver.c
  src/qemu/qemu_monitor_text.c src/remote/remote_driver.c
  src/storage/storage_backend_disk.c src/storage/storage_driver.c
  src/util/logging.c src/xen/sexpr.c src/xen/xend_internal.c
  src/xen/xm_internal.c: Steve Grubb <sgrubb@redhat.com> sent a code
  review and those are the fixes correcting the problems

When building with --disable-nls, I got a few messages like this:

storage/storage_backend.c: In function 'virStorageBackendCreateQemuImg':
storage/storage_backend.c:571: warning: format not a string literal and no format arguments

Fix these up.
Signed-off-by: NChris Lalancette <clalance@redhat.com>

The LXC driver was mistakenly returning -1 for lxcStartup()
in scenarios that are not an error. This caused the libvirtd
to quit for unprivileged users. This fixes the return code
of LXC driver, and also adds a "name" field to the virStateDriver
struct and logging to make it easier to find these problems
in the future

* src/driver.h: Add a 'name' field to state driver to allow
  easy identification during failures
* src/libvirt.c: Log name of failed driver for virStateInit
  failures
* src/lxc/lxc_driver.c: Don't return a failure code for
  lxcStartup() if LXC is not available on this host, simply
  disable the driver.
* src/network/bridge_driver.c, src/node_device/node_device_devkit.c,
  src/node_device/node_device_hal.c, src/opennebula/one_driver.c,
  src/qemu/qemu_driver.c, src/remote/remote_driver.c,
  src/secret/secret_driver.c, src/storage/storage_driver.c,
  src/uml/uml_driver.c, src/xen/xen_driver.c: Fill in name
  field in virStateDriver struct

Nearly all of the methods in src/util/util.h have error codes that
must be checked by the caller to correct detect & report failure.
Add ATTRIBUTE_RETURN_CHECK to ensure compile time validation of
this

* daemon/libvirtd.c: Add explicit check on return value of virAsprintf
* src/conf/domain_conf.c: Add missing check on virParseMacAddr return
  value status & report error
* src/network/bridge_driver.c: Add missing OOM check on virAsprintf
  and report error
* src/qemu/qemu_conf.c: Add missing check on virParseMacAddr return
  value status & report error
* src/security/security_selinux.c: Remove call to virRandomInitialize
  that's done in libvirt.c already
* src/storage/storage_backend_logical.c: Add check & log on virRun
  return status
* src/util/util.c: Add missing checks on virAsprintf/Run status
* src/util/util.h: Annotate all methods with ATTRIBUTE_RETURN_CHECK
  if they return an error status code
* src/vbox/vbox_tmpl.c: Add missing check on virParseMacAddr
* src/xen/xm_internal.c: Add missing checks on virAsprintf
* tests/qemuargv2xmltest.c: Remove bogus call to virRandomInitialize()

This will simplify adding FindPoolSources support to more pool backends in
the future (as well as the test driver).

Similar in theory to *AssignDef type functions, this duplicate functionality
will be used by an future FindPoolSources implementations.

Finally, we get to the point of all this.

Move virStorageGetMetadataFromFD() to virStorageFileGetMetadataFromFD()
and move to src/util/storage_file.[ch]

There's no functional changes in this patch, just code movement

* src/storage/storage_backend_fs.c: move code from here ...

* src/util/storage_file.[ch]: ... to here

* src/libvirt_private.syms: export virStorageFileGetMetadataFromFD()

Introduce a metadata structure and make virStorageGetMetadataFromFD()
fill it in.

* src/util/storage_file.h: add virStorageFileMetadata

* src/backend/storage_backend_fs.c: virStorageGetMetadataFromFD() now
  fills in the virStorageFileMetadata structure

Prepare the code probing a file's format and associated metadata for
moving into libvirt_util.

* src/storage/storage_backend_fs.c: re-factor the format and metadata
  probing code in preparation for moving it

Rename virStorageVolFormatFileSystem to virStorageFileFormat and
move to src/util/storage_file.[ch]

* src/Makefile.am: add src/util/storage_file.[ch]

* src/conf/storage_conf.[ch]: move enum from here ...

* src/util/storage_file.[ch]: .. to here

* src/libvirt_private.syms: update To/FromString exports

* src/storage/storage_backend.c, src/storage/storage_backend_fs.c,
  src/vbox/vbox_tmpl.c: update for above changes

* daemon/qemud.c, src/Makefile.am: Update for changed paths
* src/node_device*.{h,c}: Move to src/node_device/
* src/storage/storage_backend.c: Remove bogus import of node_device.c

* daemon/qemud.c, src/Makefile.am: Adapt for changed paths
* src/storage*.c, src/storage/*.h, src/parthelpre.c: Move
  to src/storage/