Add json schema validation for V3 API's
Add json schema validation for V3 API's

This spec proposes adding json schema validation for request body
of Cinder's V3 APIs.

Partial-Implements: bp json-schema-validation
Change-Id: I9d0f3f70bd3dd70ecdcaccc2e4ccff3e4d4c8f92

openstack/cinder-specs