juju-quickstart 1.5.0

* Initial support for the manual provider type.
* Better integration with MAAS: improved the way node addresses are retrieved.
* Auto-detect environment data when MAAS (Bare Metal) is used.
* Improve the way Juju Quickstart detects the Juju environment is already running.
* Interactive session no longer hides errors under certain circumstances.
* Dropped support for Juju < 1.18.