RemoteFsDriver: copy_image_to_volume and copy_volume_to_image
RemoteFsDriver: copy_image_to_volume and copy_volume_to_image

This functionality was recently added to the NFS driver --
it should instead be added to the RemoteFsDriver class to cover
both NFS and GlusterFS drivers.

Change-Id: I10136f8d1628128a93c4adfe2cb9447b99720558

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