Make sphinx builders configurable in LocalBuildDoc

Sphinx builders were hard coded to be html and man in LocalBuildDoc
before. This enables users to config a list of builders in setup.cfg
as a comma seperated list, e.g. html,man,doctest

Change-Id: I3528b208c7e719286fe8816acf65f8efdc5844c6
Make ChangeLog more condensed

Just duplicating the git log isn't particularly exciting. Make
the ChangeLog a list of change subjects grouped by tag.

New output can be seen here: http://paste.openstack.org/show/49999

Change-Id: I7bf4d89dcdba135de663d75895b30963f7a44662
Let git do mailmap mapping for us

It turns out, git log already knows how to process mailmap files.
Just defer to it and stop processing that in python.

Change-Id: Ib3d6f85683fcbe8b5002117d2ee46dc3c008cae7
Clean up integration script

There are several things in the script that are no longer necessary.
Remove them to clean things up so that we can reason about this
script with less stress.

Change-Id: I02863c8ab98d7e403fada2973a0b5807e1b75595
Enable wheel processing in the tests

In advance of enabling wheel processing in pbr overall, enable it
in the integration testing.

Change-Id: Ide460e000c872902590726639d42a5ecac9e4673
Merge "Make sphinx builders configurable in LocalBuildDoc"
Merge "Make ChangeLog more condensed"
Merge "Let git do mailmap mapping for us"