Brick: fix bug in tgt conf for volume
Brick: fix bug in tgt conf for volume

872b7ca0fc5ce4911fdaadee464d46be5a38058d was intended to explicitly
specify the driver being used by tgt for each target. The issue is that
'lld' is not a valid directive therefore the default is being used. The
default used by tgt is iscsi.

This commit replaces 'lld' with the correct directive of 'driver'.

Change-Id: I6153ee8b24039aedc4ab471f7d00517411791dac
Closes-bug: #1396265

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