Use wsgi template for nova-placement and cinder-api

Use templated wsgi from system.apache.server.site.
to make sure Keepalive is disabled when ssl is used.

For more info please see:

https://bugs.launchpad.net/devstack/+bug/1630664
https://review.openstack.org/#/c/433738/

Change-Id: I887a43677855986edc29e2f93a14b6a1d27fa24d
Related-Prod: PROD-18995
2 files changed