Implement handle_check for Cinder and EC2 Volumes

This allows OS::Cinder::Volume and AWS::EC2::Volume to perform a sanity
check when performing a stack.check()

Change-Id: I5bb5a25b05391076c998a91f877ccd3986da81ef
Implements: blueprint stack-check
Merge "Implement handle_check for Cinder and EC2 Volumes"