Add index.rst section for patches merged to master

Add new section called "MASTER" to the release notes, where all patches
that implement blueprints or fix bugs should update the list. This list
will be used for the release notes when a new version is released.

Change-Id: If842bfbb85851fb7a9e22259423da204f4c308f4
change assertEquals to assertEqual

According to http://docs.python.org/2/library/unittest.html
assertEquals is a deprecated alias of assertEqual.

https://review.openstack.org/#/c/56652/ updates to a new version of
hacking that enforces H602. Turning that on requires this change to land
first.

Re-do of https://review.openstack.org/#/c/53510 since that is abandoned.

Change-Id: Ie621edc8770e2015df5712f77d4cf9679b02bd0f