Deprecate using intree nova placement wsgi template

All openstack services uses 99% persent same wsgi apache config.
This patch adds functionality to configure nova-placement wsgi conf
from apache pillar. To do this on cluster level the following file
should be included:
 - system.apache.server.site.nova-placement

The intree wsgi template will be removed when we switch all model
and cookiecutter to use apache template.

Change-Id: Id6ec48ffa93db572d6a2a8257946a4a1d2fbedb3
6 files changed