The vars port specification in the keystone-httpd.conf.j2 were
incorrectly referencing vars instead of strings, causing failures.
Additionally, the conf created for uwsgi and apache includes all the
WSGI settings - which is not in line with how it should look.
Encasing the WSGI settings in an if statement so that it lines up with
the example conf file from the keystone docs.
We will also need to enable the proxy_http module for uwsgi with apache.
Change-Id: I64eec88452333eee6397ccbad13cd80a5275e607
38dbd423d6