DRBD: remove a wrong comma, it creates a tuple
DRBD: remove a wrong comma, it creates a tuple

Change-Id: I8a1152b9f173171be7611ed600ade1033791a5bf

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