This eliminates the use of hostvars[] in container creation which allows
us to use templated variables, necessary for the fix for #1399427 which
has already been merged.
Notes:
* Creates containers in parallel.
* Improves flexability in container create as a specific group or container
can be targeted on the CLI.
* Syntax clean up.
* Adds option to specify the container volume group name.
* Removes the "ignored" failure note when running in an environment that does
not use LVM and have an LXC volume group.
Closes-Bug: #1399427
Change-Id: I4270a9d11039b62d631f82d24de7cc87d5f142c9
96b9b494a4