Description of change
This PR ensures that all clouds are created with at least one region - if none were supplied, Juju will create a 'default region.
As a drive-by, remove multi-cloud feature flag from API: add-cloud can no happen without a 'multi-cloud' enabled on the controller. It is no longer required since we have improved add-coud experience dramatically, including introduction of 'white-list', force, etc.
Bug reference
for 'default' region: https://bugs.launchpad.net/juju/+bug/1819409 for multi-cloud: https://bugs.launchpad.net/juju/+bug/1829342
该提问来源于开源项目:juju/juju