Updated openstack/openstack
Project: openstack/nova  06aed18464af66b40f3303a86bcdd7f84655fd5f

Doc: minor fixes to unit testing devref

The unit testing devref had a bit of inconsistent formatting, and a reference
to HACKING.rst which could have been linkifed.  This patch fixes both of those,
and additionally the examples have been updated to reflect the recent split
into functional and unit tests.

Change-Id: I15129808d0d1271c1223e7ab8d8532f8cb2f7293