Catch up with upstream's changes to local_settings.py

In the past 6 months, quite a few things have changed upstream. It's
time to catch up and add the changes from local_settings.py.example.

Fixes: bug #1223317

Change-Id: I1fcabdf926263f1c6b6f19acd34ec59bf17283c3
Preparing for 2.2.0 release.

Updated Modulefile version.
Updated README.md release notes.

Closes-bug: #1224770

Change-Id: If3f334c524a56dc9fa65a312897112ce0207fe1c
Merge "Preparing for 2.2.0 release."
Updated user and group in debian params.

The havana release of horizon has the wsgi process
user and group as horizon in the debian packages.

Closes-bug: #1224770

Change-Id: I9a36ac12188d71721d16160055f3dc6fcd88b03e
Merge "Updated user and group in debian params."