Example:

when: registered_variable|failed

Allow the group_vars and host_vars directories to be stored alongside the playbook as well as inventory.

Keep ansible-playbook from bombing without extra-vars

A recent change to ansible-playbook to support json extra-vars
also inadvertently broke the script when no extra-vars are
provided. Simply checking to make sure it is defined and truthy
should take care of the issue.

add "size_{total,free}" to the "mount" facts