Templatize keystone ssl keys/certs

Keystone keys/certs files are fetched from heat metadata.
This will allow us distribute identical keyst/certs to all
control nodes instead of having different keys/certs on each node.

Relies-on: I6d4efa753b97bb8cdbd07b1bf7b1cd123f7a32ed
Related to blueprint tripleo-icehouse-ha-production-configuration

Change-Id: I420957eb883ef4e21440171fb41c5b46f8e743fa
Merge "Templatize keystone ssl keys/certs"