packaging: setup: iSCSI: fix Host ID validation

for iSCSI support on additional host, the storage pool
has to be started while validating Host ID in order to
populate /rhev.

Change-Id: Ia3185bb20cbdfb128c529c35d2cc33b1879b5f29
Bug-Url: https://bugzilla.redhat.com/1099882
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>