Add initial config function and keystone support

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