Add tasks

Break things out into tasks:
  1. Create/Boot an instance
  2. Deploy devstack using local.conf template
  3. Run tempest
  4. Collect logs and fetch them
  5. Terminate Instance

Also started a playbook runner to call this directly from the
my service that's "listening" to the OpenStack Gerrit stream.

TODO:
Finish up the pb runner
Move the extra_vars to a variables.yml file or something