Fixed inconsistency in iqn
Fixed inconsistency in iqn

Brick's TargetAdmin classes have a
default value set in __init__ for
iscsi_target_prefix.   The unit test was changing
the value returned for the internal _get_target,
but wasn't changing the CONF.iscsi_target_prefix to
match.  So the default value in the __init__ was
being used and hence the differences.

This patch sets the configuration's iscsi_target_prefix
which alters the values passed into the driver.  This
also makes the tests consistent between the iqn of the volume
at create time and delete time.

Closes-Bug: #1271249
Change-Id: Ie3308cf68adcbdff6057ea795af1299dded82e14

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