Add more info to delete error message.
Add more info to delete error message.

Our cases for what we allow delete on are limited, this is
fine, however we should log the status of a volume that we
are unable to delete so there's some feed-back as to exactly
why the delete call failed.

Change-Id: I95a9584d4875e188024be13bb53246be63c72374

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