Some scripts to help with some simple auto testing

# `do_sos_avocado.sh`

Runs avocado tests on the latest commits in your folder on all the supported
distros

# `do_sos_testing.sh`

Runs a quick sos report on all distros from a PPA or a snap channel

# `sos_collect_testing.sh`

* Creates a new juju model
* Launches N number of ubuntu units
* Runs sos collect to test the functionality

# `get_image_names.sh`

Grabs image names for Cirrus CI testing purspoes, this ensures we can get
these quickly, rather than trawling on GCE UI