core: [RFE] More informative message in event when a VM started in Paused Mode

When starting a VM in a pause mode we want to write to the event log:
Starting in paused mode ${VM_NAME} was initiated by ${USER_NAME}.
Instead of the regular message:
Starting VM ${VM_NAME} was initiated by ${USER_NAME}.

Change-Id: I323636994ff74948b3f9039e990b1cae5e79d3cb
Bug-Id: https://bugzilla.redhat.com/885135
Signed-off-by: Shahar Havivi <shavivi@redhat.com>