Update link in HACKING.rst and Make it DRYer

* Fix URL for global hacking doc, related to
  I579e7c889f3addc2cd40bce0c584bbc70bf435e2
* Remove section on locals, as its already in openstack-dev/hacking
  (http://git.openstack.org/cgit/openstack-dev/hacking/tree/doc/source/index.rst#n154)

Change-Id: If944b088f343404c5b90b02afe6f781dd1db914d
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