Adding a VNC WebSocket support for QEMU driver.  This functionality is
in upstream qemu from commit described as v1.3.0-982-g7536ee4, so the
capability is being recognized based on QEMU version for now.

PCIO device assignment using VFIO requires read/write access by the
qemu process to /dev/vfio/vfio, and /dev/vfio/nn, where "nn" is the
VFIO group number that the assigned device belongs to (and can be
found with the function virPCIDeviceGetVFIOGroupDev)

/dev/vfio/vfio can be accessible to any guest without danger
(according to vfio developers), so it is added to the static ACL.

The group device must be dynamically added to the cgroup ACL for each
vfio hostdev in two places:

1) for any devices in the persistent config when the domain is started
   (done during qemuSetupCgroup())

2) at device attach time for any hotplug devices (done in
   qemuDomainAttachHostDevice)

The group device must be removed from the ACL when a device it
"hot-unplugged" (in qemuDomainDetachHostDevice())

Note that USB devices are already doing their own cgroup setup and
teardown in the hostdev-usb specific function. I chose to make the new
functions generic and call them in a common location though. We can
then move the USB-specific code (which is duplicated in two locations)
to this single location. I'll be posting a followup patch to do that.

Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Commit 1ccf2227 forgot to
add the output to the augeas test

The defines QEMU_REMOTE_PORT_MIN and QEMU_REMOTE_PORT_MAX were used to
find free port when starting domains. As this was hard-coded to the
same ports as default VNC servers, there were races with these other
programs. This patch includes the possibility to change the default
starting port as well as the maximum port (mostly for completeness) in
qemu config file.

Support for two new config options in qemu.conf is added:
 - remote_port_min (defaults to QEMU_REMOTE_PORT_MIN and
   must be >= than this value)
 - remote_port_max (defaults to QEMU_REMOTE_PORT_MAX and
   must be <= than this value)

When adding new config file parameters, the corresponding
additions to the augeas lens' are constantly forgotten.
Also there are augeas test cases, these don't catch the
error, since they too are never updated.

To address this, the augeas test cases need to be auto-generated
from the example config files.

* build-aux/augeas-gentest.pl: Helper to generate an
  augeas test file, substituting in elements from the
  example config files
* src/Makefile.am, daemon/Makefile.am: Switch to
  auto-generated augeas test cases
* daemon/test_libvirtd.aug, daemon/test_libvirtd.aug.in,
  src/locking/test_libvirt_sanlock.aug,
  src/locking/test_libvirt_sanlock.aug.in,
  src/lxc/test_libvirtd_lxc.aug,
  src/lxc/test_libvirtd_lxc.aug.in,
  src/qemu/test_libvirtd_qemu.aug,
  src/qemu/test_libvirtd_qemu.aug.in: Remove example
  config file data, replacing with a ::CONFIG:: placeholder
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>