packaging: setup: cleanup storagePool/domainMonitor on error

disconnect storage pool connection and domain monitoring
if an error occurs while deploying the hosted engine VM

Change-Id: If8a408a7291b7a4478380fb6a98a0120699563e3
Bug-Url: https://bugzilla.redhat.com/1026344
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>