Make config-download workflow's verbosity configurable
Make config-download workflow's verbosity configurable

This exposes the 'verbosity' option from the ansible mistral action,
which will allow us to view more verbose outputs from the ansible
playbook's run.

Change-Id: If7207428561e9f64950d9e2ac438b94d6556fe0d

openstack/tripleo-common,openstack/tripleo-common