sp: remove scsiKey from connectStoragePool

Change-Id: I39c02f9256b1ef802ca4ec434a19aeecfea1f87a
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21557
Reviewed-by: Dan Kenigsberg <danken@redhat.com>