Avoid warnings like this:
file:nnn:format not a string literal and no format arguments

* qemud/qemud.c: Insert a "%s" format argument.
* qemud/remote.c: Likewise.
* src/iptables.c: Likewise.
* src/qemu_driver.c: Likewise.
* src/storage_backend.c: Likewise.
* src/storage_backend_fs.c: Likewise.
* src/storage_backend_iscsi.c Likewise.
* src/storage_backend_logical.c: Likewise.
* src/storage_conf.c: Likewise.
* src/storage_driver.c: Likewise.

Also add "make syntax-check" rules to ensure no new uses sneak in.

There are many uses of write like this:

    if (write (fd, xml, towrite) != towrite)
        return -1;

The problem is that the syscall can succeed, yet write less than
the requested number of bytes, so the caller should retry
rather than simply failing.

This patch changes most of them to use util.c's safewrite wrapper,
which encapsulates the process.  Also, there were a few cases in
which the retry loop was open-coded, and I replaced those, too.

* Makefile.maint (sc_avoid_write): New rule, to avoid recurrence.
* .x-sc_avoid_write: New file.  Record two legitimate exemptions.
* qemud/qemud.c (sig_handler, qemudClientWriteBuf): Use safewrite, not write.
* src/conf.c (__virConfWriteFile): Likewise.
* src/qemu_conf.c (qemudSaveConfig, qemudSaveNetworkConfig): Likewise.
* src/qemu_driver.c (qemudWaitForMonitor, qemudStartVMDaemon)
(qemudVMData, PROC_IP_FORWARD): Likewise.
* proxy/libvirt_proxy.c: Include "util.h".
(proxyWriteClientSocket): Use safewrite.
* src/test.c (testDomainSave, testDomainCoreDump): Likewise.
* src/proxy_internal.c (virProxyWriteClientSocket): Likewise.
* src/virsh.c: Include "util-lib.h".
(vshOutputLogFile): Use safewrite.
* src/console.c: Include "util-lib.h".
(vshRunConsole): Use safewrite.

We currently use safewrite from inside libvirt and don't want to publish
any such function name.  However, we do want to use it in applications
like virsh, libvirtd and libvirt_proxy that link with libvirt.  To that
end, this change moves that function definition (along with the nearly
identical saferead) into a new file, util-lib.c.  To avoid maintaining
separate copies of even such small functions, we simply include that new
file from util.c.  Then, the separate applications that need to use
safewrite simply compile and link with util-lib.c.

Of course, this does mean that each of those applications will
containing two copies of these functions.  However, the functions
are so small that it's not worth worrying about that.

* src/util.c (saferead, safewrite): Move function definitions to
util-lib.c and include that .c file.
* src/util-lib.c (saferead, safewrite): New file.  Functions from src/util.c
with slight change (s/int r =/ssize_t r =/) to reflect read/write return type.
* src/util-lib.h: Declare the two moved functions.
* src/util.h: Remove declarations.  Include src/util-lib.h.
* proxy/Makefile.am (libvirt_proxy_SOURCES): Add src/util-lib.c.
* qemud/Makefile.am (libvirtd_SOURCES): Likewise.
* src/Makefile.am (virsh_SOURCES): Add util-lib.c.  Remove some SP-before-TAB.

* src/iptables.c (iptRulesSave) [!ENABLE_IPTABLES_LOKKIT]:
Mark parameter as used.

* src/openvz_conf.c (openvzSetUUID): Rewrite to avoid unchecked
lseek, write, and close as well as a potential file descriptor leak.

* src/openvz_conf.c (openvzLocateConfDir, openvzGetVPSUUID):
(openvzSetUUID): Don't dereference NULL upon failure.

        * src/openvz_conf.c: Double-free fix (Anton Protopopov).

* src/internal.h: move xstrol() variants from here ...

* src/util.[ch]: ... to here and rename to virStrToLong()

* src/libvirt_sym.version: export __virStrToLong_i() for
virsh and qemud.

* src/nodeinfo.c, src/stats_linux.c, src/virsh.c,
  src/xend_internal.c, qemud/qemud.c: replace xstrtol()
calls with virStrToLong()

* src/nodeinfo.h: don't include internal.h, which was only
needed for xstrtol(), but instead include libvirt.h which
is suffificient for the declarations in the header.

* src/hash.c: fix a couple of problems in virHashRemoveSet based
  on Hiroyuki Kaguchi patch and explanations.
Daniel

* po/POTFILES.in: Add names of many new files.
* Makefile.maint (err_func_re): Add qemudLog.
Mark diagnostics with _(...).  Split some long lines.
* qemud/qemud.c (remoteCheckCertFile, remoteInitializeGnuTLS):
(qemudDispatchSignalEvent, qemudSetCloseExec, qemudSetNonBlock):
(qemudWritePidFile, qemudListenUnix, remoteMakeSockets):
(remoteListenTCP, qemudInitPaths, qemudInitialize):
(qemudNetworkInit, remoteInitializeTLSSession, remoteCheckDN):
(remoteCheckCertificate, remoteCheckAccess, qemudDispatchServer):
(qemudClientReadBuf, qemudDispatchClientRead):
(qemudClientWriteBuf, qemudDispatchClientWrite, qemudOneLoop):
(remoteConfigGetStringList, checkType, GET_CONF_STR):
(remoteConfigGetAuth, remoteReadConfigFile, main):
* qemud/remote.c (remoteDispatchAuthSaslInit, remoteSASLCheckSSF):
(remoteSASLCheckAccess, remoteDispatchAuthSaslStart):
(remoteDispatchAuthSaslStep, remoteDispatchAuthSaslInit):
(remoteDispatchAuthSaslStart, remoteDispatchAuthSaslStep):
(qemudGetSocketIdentity, remoteDispatchAuthPolkit):
* src/iptables.c (notifyRulesUpdated, MAX_FILE_LEN, iptRulesSave):
(iptRulesReload):
* src/qemu_conf.c (qemudExtractVersionInfo, qemudLoadConfig):
(qemudLoadNetworkConfig, qemudScanConfigDir):
* src/qemu_driver.c (qemudSetCloseExec, qemudSetNonBlock):
(qemudAutostartConfigs, qemudStartup, qemudReload):
(qemudWaitForMonitor, qemudStartVMDaemon, qemudVMData):
(qemudShutdownVMDaemon, qemudStartNetworkDaemon):
(qemudShutdownNetworkDaemon, qemudMonitorCommand):
(qemudDomainUndefine, qemudNetworkUndefine):
* src/uuid.c (virUUIDGenerate):
* src/xm_internal.c (xenXMAttachInterface):

* build-aux/useless-if-before-free: Rename from ...
* build-aux/find-unnecessary-if-before-free: ... this.  Remove file.
Also changed it so that new names are no longer hard-coded in the
script.  Instead, they're supplied via options:
* Makefile.cfg (useless_free_options): Define.
Add xmlXPathFreeObject to the list of free-like functions it detects.
* Makefile.maint (sc_avoid_if_before_free): Reflect script renaming.
* .x-sc_avoid_if_before_free: Likewise.
* src/openvz_conf.c (openvzParseXML): Remove useless "if"-before-free.
* src/qemu_conf.c (qemudParseXML, qemudParseNetworkXML): Likewise.
* src/virsh.c (cmdVNCDisplay, cmdTTYConsole, cmdDetachInterface):
(cmdDetachDisk): Likewise.
* src/xm_internal.c (xenXMConfigSetIntFromXPath): Likewise.
(xenXMConfigSetStringFromXPath, xenXMParseXMLToConfig): Likewise.
(xenXMDomainAttachDevice, xenXMAttachDisk, xenXMAttachInterface):
(xenXMDomainDetachDevice): Likewise.
* src/xml.c (virXPathString): Likewise.
* tests/xmlrpctest.c (checkRequestValue): Likewise.

  by Marcus Meissner
Daniel

* src/xm_internal.[ch]: applied patch from Shigeki Sakamoto to
  add/change/delete a Disk/NIC of an inactive domains
Daniel

* src/qemu_conf.c: applied 2 patches from Guido Guenther to avoid
  crashes when reading the config file
Daniel

* src/xml.c (virDomainParseXMLOSDescHVM): Mark a diagnostic.

* Makefile.cfg (local-checks-to-skip): Remove sc_trailing_blank.
* .x-sc_trailing_blank: New file, to exempt the few binary files.

* Makefile.maint (sc_prohibit_virBufferAdd_with_string_literal):
New rule.
* src/buf.h (virBufferAddLit): Define.
* src/conf.c (virConfSaveValue): Use virBufferAddLit, in place
of virBufferAdd everywhere possible.
(virConfSaveEntry): Likewise.
* src/qemu_conf.c (qemudGenerateXML, qemudGenerateNetworkXML): Likewise.
* src/qemu_driver.c (qemudGetFeatures, qemudGetCapabilities): Likewise.
* src/test.c (testDomainDumpXML, testNetworkDumpXML): Likewise.
* src/xen_internal.c (xenHypervisorMakeCapabilitiesXML): Likewise.
* src/xend_internal.c (xend_parse_sexp_desc_os): Likewise.
(xend_parse_sexp_desc, sexpr_to_xend_topology_xml): Likewise.
* src/xm_internal.c (xenXMDomainFormatXML, xenXMDomainPinVcpu): Likewise.
* src/xml.c (virSaveCpuSet, virParseXenCpuTopology): Likewise.
(virDomainParseXMLGraphicsDescImage): Likewise.
(virDomainParseXMLGraphicsDescVFB, virDomainParseXMLOSDescHVM): Likewise.
(virDomainParseXMLOSDescPV, virDomainParseXMLDiskDesc): Likewise.
(virDomainParseXMLIfDesc, virDomainParseXMLDesc): Likewise.

* Makefile.maint (sc_unmarked_diagnostics): Check for more functions.
* src/conf.c (virConfParseValue): Remove trailing space in diagnostic.
* src/libvirt.c (do_open, virDomainMigrate): Mark diagnostics.
* src/xend_internal.c (do_connect, xenDaemonDomainDumpXMLByID): Likewise.
(xenDaemonDomainDumpXMLByName, xenDaemonCreateLinux): Likewise.
(xenDaemonDomainMigratePerform, xenDaemonDomainDefineXML): Likewise.
* src/xml.c (virXPathString, virXPathNumber, virXPathLong): Likewise.
(virXPathBoolean, virXPathNode, virXPathNodeSet): Likewise.
(virDomainParseXMLOSDescHVM): Likewise.
* src/xmlrpc.c (xmlRpcValueNew): Likewise.
(xmlRpcValueUnmarshalDictElement): Likewise.

* src/virsh.c: Add a "%s" and wrap with _(...).