[libvirt] [PATCH]: Fix non-live migration failure

[Chris Lalancette]

There is a logic error in the Qemu driver when doing a non-live migrate.
During a non-live migrate, on the source host during the Perform step, we
pause the domain; however, if there was ever a failure, we were forgetting
to unpause the domain, meaning that the domain was paused forever.  Add a
flag to tell us when we should unpause the domain after a failure.

Also, as pointed out by DV, we were unnecessarily using a snprintf to a
buffer to execute qemu monitor commands, when we could get away with
just sending a static string.  Fix that as well.

Signed-off-by: Chris Lalancette <clalance at redhat.com>
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