Implement the environmentGet API endpoint.

Also call it to retrieve the MAAS server address when in MAAS.
Fix typo and improve tests isolation.
Merge pull request #611 from frankban/retrieve-maas-server

Implement the environmentGet API endpoint.

Also call it to retrieve the MAAS server address when in MAAS.
Change the sidebar background to white.
First pass at removing the old pyjuju code and its dependencies.
Fixed typo when removing modules
Fixed spurious test failure
Review and QA feedback.
Merge pull request #613 from kadams54/added-services-bg

Change the sidebar background to white.
Merge pull request #612 from hatched/remove-pyjuju

First pass at removing the old pyjuju code and its dependencies.
Display added services in the sidebar.

Adds the actual services to the new sidebar view. Will respond to
database add and remove events.
Trim long service names.
Added tests around changing a service.
Review feedback + change handler.
Lint cleanup.