functest runner and regression tester incompatible with juju 2.9

[rodrigogansobarbieri]

Gives an error when trying to run against juju 2.9, usually because we need to use bionic:

File "/home/ubuntu/charmed-openstack-tester/.tox/func-target/lib/python3.10/site-packages/zaza/controller.py", line 40, in async_add_model
await controller.connect()
File "/home/ubuntu/charmed-openstack-tester/.tox/func-target/lib/python3.10/site-packages/juju/controller.py", line 108, in connect
await self._connector.connect_controller(controller_name, **kwargs)
File "/home/ubuntu/charmed-openstack-tester/.tox/func-target/lib/python3.10/site-packages/juju/client/connector.py", line 153, in connect_controller
await self.connect(**kwargs)
File "/home/ubuntu/charmed-openstack-tester/.tox/func-target/lib/python3.10/site-packages/juju/client/connector.py", line 117, in connect
raise JujuConnectionError(
juju.errors.JujuConnectionError: juju server-version 2.9.50 not supported

[dosaboy]

I use the func test runner with Juju 2.9 every day without issue so i dont think this is quite right. Maybe there is a more specific incompatibility with the charm you are running it against?

[dosaboy]

As a general rule I run stable branch tests on Focal (python 3.8) with a Juju 2.x controller. For master branch tests I use Jammy (python 3.10) with Juju 3.x.