Have pbr update AUTHORS but not changelog

Use pbr to update AUTHORS by running:
    python setup.py build_sphinx

However prevent it from updating the ChangeLog as its current formatting
is less desirable.

Change-Id: I5d880dbf4917e3e573ad3fd237b66064f367b597

.mailmap

@@ -0,0 +1,2 @@
+Darragh Bailey <daragh.bailey@gmail.com> <dbailey@hpe.com>
+Darragh Bailey <daragh.bailey@gmail.com> <dbailey@hp.com>

AUTHORS

@@ -1 +1,14 @@
-Darragh Bailey <dbailey@hp.com>
+Darragh Bailey <daragh.bailey@gmail.com>
+Davide Guerri <davide.guerri@hp.com>
+Eric Peterson <ejpetey@gmail.com>
+Jenkins <jenkins@jenkins.hpcloud.net>
+Jeremy Stanley <fungi@yuggoth.org>
+Jon-Paul Sullivan <jonpaul.sullivan@hp.com>
+Jonathan Brownell <brownell@hp.com>
+Jonathan Harker <code@gentlydownthe.net>
+Manuel Desbonnet <manuel.desbonnet@hp.com>
+Monty Taylor <mordred@inaugust.com>
+Paul Bourke <paul.bourke@oracle.com>
+Spencer Krum <nibz@spencerkrum.com>
+Tom Cammann <tom.cammann@hp.com>
+venkatamahesh <venkatamaheshkotha@gmail.com>

setup.cfg

@@ -24,6 +24,9 @@ classifiers =
 [global]
 commands = build_manpage.BuildManpage
 
+[pbr]
+skip_changelog = True
+
 [files]
 packages =
     git_upstream