* sync charm-helpers to classic charms
* change openstack-origin/source default to zed
* align testing with zed
* add new zed bundles
* add zed bundles to tests.yaml
* add zed tests to osci.yaml and .zuul.yaml
* update build-on and run-on bases
* add bindep.txt for py310
* sync tox.ini and requirements.txt for ruamel
* use charmcraft_channel 2.0/stable
* drop reactive plugin overrides
* move interface/layer env vars to charmcraft.yaml
Change-Id: I1a250a0591c15971840bbd6130c7cff3822eed4f
527261db5c