Use os.urandom in volume transfer
Use os.urandom in volume transfer

This patch replaces a call to random.random() with a call to
os.urandom(), which generates a higher quality random number.

Closes-Bug: #1319643

Change-Id: Ifaa2216d4905f5286884629beac52b25249d621f

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