Fix REST API service classes methods.
Fix REST API service classes methods.

Change-Id: I97b618a6788e7b9381cc8dbdaa09253dbcebd395

frossigneux/blazar,frossigneux/blazar,openstack/blazar,ChameleonCloud/blazar,openstack/blazar,paramite/blazar,ChameleonCloud/blazar,stackforge/blazar,stackforge/blazar,frossigneux/blazar,paramite/blazar