GPFS convert glance image to raw only when needed
GPFS convert glance image to raw only when needed

Modify _gpfs_fetch_to_raw to check image format.  If already in raw
format, no need to call convert_image.  In that case, simply rename
to destination name.

Change-Id: I197d99194f93c02ce3c501de25433d89b23e6a35
Fixes: bug #1201676

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