Mrtyler rejigger status

[mrtyler]

This addresses some concerns brought up by carroux way back in review:115197:

• paasta level "started/stopped" (i.e. the result of "paasta stop/start") is only accurate at the instance level. It is wrong and misleading to display it for each config
• "enabled/disabled" is not very clear

After some thinking and some consultation with mfield, here's what I did:

• paasta level "started/stopped" is reported only at the top level (parallel with git sha), and no longer as part of individual configs
• Change "enabled/disabled" to "scheduled/not scheduled"
  -- mfield noticed that there are sort of three states here: enabled, disabled because the whole service is disabled, disabled because this is an old version that we're keeping around for history. We couldn't think of a great way to communicate those three states and differentiating between the latter two would require additional refactoring, so I just went with "scheduled/not scheduled".

Screenshot:

[mrtyler]

I have a small window left before I'm out of here, so I'm merging this early to build it and try it out tonight. Please still review and comment.

[solarkennedy]

This is good, thank you for continuing to improve the output of this. Lots of people (eventually) will be running this command a lot I think.