Add the 'docs' key and point it at a Discourse topic
previously populated with the charm's README contents.
When the new charm revision is released to the Charmhub,
this Discourse-based content will be displayed there. In
the absense of the this new key, the Charmhub's default
behaviour is to display the value of the charm's
'description' key.
* sync charm-helpers to classic charms
* change openstack-origin/source default to quincy
* add mantic to metadata series
* align testing with bobcat
* add new bobcat bundles
* add bobcat bundles to tests.yaml
* add bobcat tests to osci.yaml
* update build-on and run-on bases
* drop kinetic
* update charmcraft_channel to 2.x/stable
- update bundles to include UCA pocket tests
- update test configuration
- update metadata to include kinetic and lunar
- update snapcraft to allow run-on for kinetic and lunar
