Change to add response status codes for Cinder

Cinder API docs doesn't include Error responses. This change
adds details about the common response status codes
returned by the Block Storage Service. Changes include
modification both at the v2 and v1 layer.

Closes-Bug: #1244395
Change-Id: I08f4c3d32e57b56c82f35663f6aed12a706f4a8d
Merge "Change to add response status codes for Cinder"