core: VdsNotRespondingTreatment Job is not marked as finished.

When a hypervisor gets into non responding state and it is fenced the job
VdsNotRespondingTreatment is not marked as finished and get stuck in the
tasks list.

Change-Id: I956c8f8d51e8c9569013973044494a8c95a58454
Bug-Url: https://bugzilla.redhat.com/1075500
Signed-off-by: lzelkha@redhat.com <lzelkha@redhat.com>