update Images API v2 quick ref

The Images API quick-ref docs are still at 2.0 (pre-grizzly).
They need to be updated to Grizzly (2.1, some new calls) and
Havana (2.2, some response body modifications).  "Since" fields
are added where appropriate to indicate when the call was
introduced into the Images v2 API.

Also updated schema examples to illustrate v 2.2 response.

Closes-Bug: #1233793
Change-Id: I5996e27c863212c50ea6a18468d9e5263471126a
Merge "update Images API v2 quick ref"