Initial support for Nova in Ansible

Partially-Implements: blueprint ansible-service

Change-Id: I4b0a74bd3e5daa5664f5e1e622bfb40c3285949e

Add set_configs function that implements the flow from the proposed
ansible-multi spec. Move start.sh to config-internal.sh to preserve existing
behaviour.

config-externall.sh copies the appropriate configs in from the bind'd
location and sets permissions and ownership appropriately.

Partially Implements: blueprint ansible-multi

Change-Id: I53fca0660451087f273fefc3c63e0d8cf1a2c096