Convert RBD unit tests to use mock instead of mox
Convert RBD unit tests to use mock instead of mox

Change-Id: If32e14a8f5ff180b6c0ff46797bcb81b21f805f1
Closes-bug: 1261864

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