This patch introduces an optional backend encryption for Horizon and
Placement services. When used in conjunction with enabling TLS for
service API endpoints, network communcation will be encrypted end to
end, from client through HAProxy to the Horizon and Placement services.

Change-Id: I9cb274141c95aea20e733baa623da071b30acf2d
Partially-Implements: blueprint add-ssl-internal-network

Add TLS support for Glance api using HAProxy to perform TLS termination.

Change-Id: I77051baaeb5d3f7dd9002262534e7d35f3926809
Partially-Implements: blueprint add-ssl-internal-network

This patch introduces an optional backend encryption for Heat
service. When used in conjunction with enabling TLS for service API
endpoints, network communcation will be encrypted end to end, from
client through HAProxy to the Heat service.

Change-Id: Ic12f7574135dcaed2a462e902c775a55176ff03b
Partially-Implements: blueprint add-ssl-internal-network
Depends-On: https://review.opendev.org/722028/