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Description of problem:
  'virsh domjobinfo' hang while creating internal snapshot.

Version-Release number of selected component:
   libvirt-3.2.0-3.virtcov.el7.x86_64
   qemu-kvm-rhev-2.9.0-2.el7.x86_64

How reproducible:
   100%

Steps to Reproduce:
1.Prepare a running guest:
# virsh list
 Id    Name                           State
----------------------------------------------------
 80    rhel7.3-min                    running


2.Create internal snapshot:
#virsh snapshot-create rhel7.3-min

3.Open another terminal while doing step 2, execute 'virsh domjobinfo',the command hangs for a while then report errors:
#virsh domjobinfo rhel7.3-min
error: Timed out during operation: cannot acquire state change lock (held by remoteDispatchDomainSnapshotCreateXML)

Actual resuts:
'virsh domjobinfo' hang  while creating internal snapshot

Expected results:
'virsh domjobinfo' should not hang  while creating internal snapshot

Internal snapshot ("savevm") is a synchronous command in qemu so there's no way how we could acquire any statistics, since the monitor is blocked.