Fixes lp#1840205: show default region from client store. #10533
Merged
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Description of change
By default, Juju will pick the first region for the clouds that have more than one region. Users can change that to suit their needs and preferences using 'juju default-region' command. This will be the region used by all commands - bootstrap, add-model, credential validations, etc - that care about region if the user does not explicitly specify a region using a --region option at CLI.
Whilst Juju was mostly correctly using the default region when user set it, Juju was not correctly reporting it in 'juju clouds', 'juju show-cloud', etc.
This PR fixes this.
As a drive-by some renamed some variables in tests that were colliding with imported packages names.
QA steps
Bug reference
https://bugs.launchpad.net/juju/+bug/1840205