Automatically detect a logged in MAAS API, so that it is possible to use the stored credentials to create and bootstrap a MAAS environment without user intervention.
QA: - ssh to the GUI MAAS; - destroy the existing environment; - remove the ~/.juju directory; - use the MAAS UI (http://maas.jujugui.org/MAAS/nodes/) to release the nodes if they are not in a ready state; - this branch is already checked out in ~/juju-quickstart/sandbox/; - start quickstart from there: cd ~/juju-quickstart/sandbox/ && .venv/bin/python juju-quickstart - quickstart should show the option to automatically create and bootstrap the MAAS environment; - select the option and wait for the envirnment to be ready: this can fail due to juju/maas interaction problems we currently have, retrying the process should eventually succeed.