Fix Huawei HVS driver AttributeError
Fix Huawei HVS driver AttributeError

This patch checks the iSCSI port info and raises an exception
if it can not get the port info from the configuration.

Closes-bug: #1237185
Change-Id: I341ccbe77abd25421e5ee0b2d07ace3759fbccef

alex8866/cinder,potsmaster/cinder,tlakshman26/cinder-https-changes,dims/cinder,spring-week-topos/cinder-week,sasukeh/cinder,saeki-masaki/cinder,saeki-masaki/cinder,nexusriot/cinder,alex8866/cinder,ge0rgi/cinder,manojhirway/ExistingImagesOnNFS,JioCloud/cinder,duhzecca/cinder,j-griffith/cinder,dims/cinder,abusse/cinder,Accelerite/cinder,takeshineshiro/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,tlakshman26/cinder-new-branch,leilihh/cinder,petrutlucian94/cinder,NetApp/cinder,scality/cinder,Thingee/cinder,mahak/cinder,cloudbau/cinder,redhat-openstack/cinder,Nexenta/cinder,hguemar/cinder,Akrog/cinder,nikesh-mahalka/cinder,hguemar/cinder,nikesh-mahalka/cinder,Accelerite/cinder,NeCTAR-RC/cinder,julianwang/cinder,blueboxgroup/cinder,leilihh/cinder,apporc/cinder,Hybrid-Cloud/cinder,cloudbase/cinder,mahak/cinder,cloudbase/cinder,Paul-Ezell/cinder-1,redhat-openstack/cinder,Datera/cinder,nexusriot/cinder,apporc/cinder,ntt-sic/cinder,bswartz/cinder,ntt-sic/cinder,winndows/cinder,Datera/cinder,Akrog/cinder,Nexenta/cinder,openstack/cinder,tlakshman26/cinder-https-changes,eharney/cinder,spring-week-topos/cinder-week,julianwang/cinder,github-borat/cinder,scottdangelo/RemoveVolumeMangerLocks,takeshineshiro/cinder,petrutlucian94/cinder,JioCloud/cinder,Thingee/cinder,phenoxim/cinder,scality/cinder,duhzecca/cinder,rakeshmi/cinder,NetApp/cinder,tlakshman26/cinder-new-branch,CloudServer/cinder,CloudServer/cinder,bswartz/cinder,scottdangelo/RemoveVolumeMangerLocks,j-griffith/cinder,blueboxgroup/cinder,potsmaster/cinder,cloudbau/cinder,winndows/cinder,rakeshmi/cinder,sasukeh/cinder,phenoxim/cinder,abusse/cinder,Hybrid-Cloud/cinder,openstack/cinder,Thingee/cinder,Paul-Ezell/cinder-1,github-borat/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,NeCTAR-RC/cinder,eharney/cinder,manojhirway/ExistingImagesOnNFS