Add testing and support for python 3.9. #1429
Merged
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Remove testtools as a test dependency. It's not used except for a
version skip that is easy to replace. testtools still relies on
unittest2, a python 2-ism that generates warnings in python 3.9.
Fix the snapcraft release by updating to a newer snapcraft action
that fixes the 'add-path' error.
Fixes #1392