Don't source devtest_end.sh.

It doesn't export anything or set any variables.

Change-Id: Idf5a5d07d821f08e79c7c3a4ed4ba6486c15282e
Attempt to make devtest_testenv docs work better.

Based on a mammoth IRC conversation...

Change-Id: I818568e813dff73ad707e9fa8e3af94a98244d84
Long overdue change to use multiple -P's with heat

The heat client change to support this has been out there a while,
lets use it.

Needs to land with Ia501bc42f821ce1cdc3f39ddee3622144ace0d8a.

Change-Id: Icfa6268a96afe10eb2754cbe1d92dd0e3ca6decb
Support flat-networks for the overcloud.

This is part of the ci-overcloud deployment automation arc.

Change-Id: I3a1288381a2006a1ef92a63b7718db97c9a59af8