core: add logging to SpmStopVDSCommand

currently SpmStopVdsCommand performs nothing in case of tasks return by
the current spm, this patch just adds logging to that case.

Change-Id: I271b7503270e57f9b08a3272f14905fd38b8d481
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1130766
Signed-off-by: Liron Aravot <laravot@redhat.com>
core: SpmStopOnIrs - set result

When executing SpmStopOnIrs we should set the return value to be
as the return value of the command that's being executed, otherwise the
caller can't tell what actually happend.

Change-Id: I5eb2a4c788ef5cf571a8de150355c85e3a9ae77a
Bug-Url: https://bugzilla.redhat.com/1119852
Bug-Url: https://bugzilla.redhat.com/1130222
Signed-off-by: Liron Aravot <laravot@redhat.com>