To reduce the number of times a container is restarted during the
build process, this patch implements the facility to consume
LXC bind mounts items from the inventory.
This allows bind mounts to be set in group_vars and therefore have
them applied on container creation instead of later when the service
install playbook runs.
Previously the container_commands option was used, but the bind
mounts are a special case which are better served with its own
set of tasks to ensure that everything needed is in place on the
host and in the container.
Needed-By: Ie2a0528fbd56c8360dd679f55fb2047e0a061c31
Change-Id: I72cdc607d7b4364d78c840bf688e43e013f40709
f26d4075e8