Add response schema validation for volumes

This is to add response schema validation for volumes.

NOTE: upload_volume schema is under discussion, so will be merged
in a seperate patch.
https://bugs.launchpad.net/cinder/+bug/1880566

Change-Id: I0613c36e9cc512a1aba1f7952ffbc7447b05198b
partially-implements: blueprint volume-response-schema-validation
8 files changed