iscsi: Add parent wwnn/wwpn or fabric capability for createVport
https://bugzilla.redhat.com/show_bug.cgi?id=1349696 As it turns out using only the 'parent' to achieve the goal of a consistent vHBA parent has issues with reboots where the scsi_hostX parent could change to scsi_hostY causing either failure to create the vHBA or usage of the wrong HBA for our vHBA. Thus add the ability to search for the "parent" by the parent wwnn/ wwpn values or just a fabric_name if someone only cares to ensure usage of the same SAN for the vHBA.
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