Parse JSON Schema Draft 10 in v2 Image update

* Add new content type to PATCH /v2/images/<id> to represent support of
  JSON Schema Draft 10: application/openstack-images-v2.1-json-patch
* Remain backwards-compatibile with existing content type
  that supports Draft 4: application/openstack-images-v2.0-json-patch
* Fixes bug 1102476

Change-Id: Iff4e8753a71457ad5a828553fcb0791b0f1c0445
Set status to 'active' after image is uploaded

Fixes bug 1034787

The recent change I made to image_data and the domain model caused this
bug to regress. This change adds assertions to the functional tests in
the hopes of preventing future regressions.

Change-Id: I02f9a5c51f54c0c778e032500079aa13ab073e3e
Merge "Parse JSON Schema Draft 10 in v2 Image update"
Merge "Set status to 'active' after image is uploaded"
Merge remote-tracking branch 'm_src_repo/webob-issue' into build-temp