Michal Privoznik 55576d3512 virQEMUCapsInitQMP: Don't dispose locked @vm
When creating qemu capabilities, a dummy virDomainObj is created just
because our monitor code expects that. However, the object is created
locked already. Then, under cleanup label, we simply unref the object
which results in whole domain object to be disposed. The object lock
is destroyed subsequently, but hey - it's still locked:

==24845== Thread #14's call to pthread_mutex_destroy failed
==24845==    with error code 16 (EBUSY: Device or resource busy)
==24845==    at 0x4C3024E: pthread_mutex_destroy (in /usr/lib64/valgrind/vgpreload_helgrind-amd64-linux.so)
==24845==    by 0x531F72E: virMutexDestroy (virthread.c:83)
==24845==    by 0x5302977: virObjectLockableDispose (virobject.c:237)
==24845==    by 0x5302A89: virObjectUnref (virobject.c:265)
==24845==    by 0x1DD37866: virQEMUCapsInitQMP (qemu_capabilities.c:3397)
==24845==    by 0x1DD37CC6: virQEMUCapsNewForBinary (qemu_capabilities.c:3481)
==24845==    by 0x1DD381E2: virQEMUCapsCacheLookup (qemu_capabilities.c:3609)
==24845==    by 0x1DD30F8A: virQEMUCapsInitGuest (qemu_capabilities.c:744)
==24845==    by 0x1DD31889: virQEMUCapsInit (qemu_capabilities.c:1020)
==24845==    by 0x1DD7DD36: virQEMUDriverCreateCapabilities (qemu_conf.c:888)
==24845==    by 0x1DDC57C0: qemuStateInitialize (qemu_driver.c:803)
==24845==    by 0x53DC743: virStateInitialize (libvirt.c:777)
==24845==

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit 954427c35477752a4ef1789035f298fc9e7287e9)
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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