Use right oslo.service entry points
Use right oslo.service entry points

Use oslo.service.service and periodic_task entry points to generate
a sample configuration file. oslo.service library doesn't have
an oslo.service entry point.

Change-Id: Ib3c320d73494258e2ef973a62a54b6afb6b95988
Closes-Bug: 1468955

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