update Images v2 API for application/openstack-images-v2.1-json-patch

Updates Appendix B.
Updates all examples using json-patch.
Deprecates application/openstack-images-v2.0-json-patch.

Change-Id: I0dcbeff5bb6ca948f5228a157cbccc5ec751d649
Closes-bug: #1236971
Merge "update Images v2 API for application/openstack-images-v2.1-json-patch"