Support IP lookup of target portal DNS name
Support IP lookup of target portal DNS name

Oracle ZFSSA iSCSI driver will resolve the DNS name to an IP
address if a DNS name is supplied in place of an IP address for
the zfssa_target_portal property.

Change-Id: Ia059a9555af7e658fae32fbe60ceca33f657bb0a
Implements: blueprint oracle-zfssa-target-portal-dns-lookup

phenoxim/cinder,openstack/cinder,ge0rgi/cinder,openstack/cinder,cloudbase/cinder,Nexenta/cinder,Datera/cinder,Hybrid-Cloud/cinder,j-griffith/cinder,Hybrid-Cloud/cinder,Nexenta/cinder,cloudbase/cinder,bswartz/cinder,NetApp/cinder,eharney/cinder,NetApp/cinder,eharney/cinder,j-griffith/cinder,mahak/cinder,bswartz/cinder,mahak/cinder,Datera/cinder,phenoxim/cinder