core: add missing log on failure to run stateless vm

The audit log message which says that run VM operation fail when VM
cannot run after stateless snapshot was created for it was not created.
This patch make sure that this audit log message will be created in that
case.

Change-Id: Ife723bfada1785028a5fa2bc27170fa42a611df9
Bug-Url: https://bugzilla.redhat.com/1039507
Signed-off-by: Arik Hadas <ahadas@redhat.com>