core: Changed event message for suspended shutdown

Changed event message text displayed at audit log during power off\shutdown of a suspended VM.

Change-Id: If788ab1117244b6fd211c17e99ddb8d31a794d35
Bug-Url: https://bugzilla.redhat.com/1073437
Signed-off-by: Eldan Shachar <eshachar@redhat.com>