* Needed to add a swift_manager/manager.py file which uses the payload
software python modules to perform certain functions on behalf of the
charm. These were part of the main charm, which couldn't be retained
in the charm due to the charm changing to Py3.
* Changed to absolute imports using the charm root as the root for all
charm modules.
* The py2 target in tox.ini is used to test the swift_manager/manager.py
file only.
* The .testr.conf file has been migrated to .stestr.conf
Change-Id: If37a393aa6ed27651b04810aa0bbf69eda37d7b4
4336b8d644