Add unity.py display of basic service-status in a venue

[rtapella]

When you “print” the configuration info with endpoints, also show the status of each endpoint (basic health: good/bad)

See unity-sds/unity-ui#25

[mike-gangl]

If we go this route, the config printed should only be for an active environment (dev, test, prod), and a project/venue will need to be defined. Otherwise health endpoints don't make much sense here.

[rtapella]

we could also go the path of a HealthService
so you'd make a new health_service and then either print it or do get_health()

[rtapella]

Current thinking is that for now we just have the one HealthService and get a consolidated set of health info from that (similar to how the web app will work).

Future potential: you can ask a particular service (e.g. a ProcessService) what it's individual health is.

[GodwinShen]

@anilnatha and @rtapella ping for status.

[rtapella]

Has not been started yet. Anil is out this week so probably will get pushed out.
I may look at it if I have time but that is unlikely because I have other stuff to do this sprint

[rtapella]

There is a draft of this with the stub json data
Will need to be updated with real endpoint when it's ready

[rtapella]

waiting for unity-sds/unity-cs#381 to wrap up

[rtapella]

Closing the initial work with stub json.
Remaining work in #91