Update Sun to get deploy state from jenkins
Update Sun to get deploy state from jenkins

Summary:
Now Sun will get the state of the deploy from jenkins itself
(/deploy-state.json), rather than trying to maintain its own state.  This gets
rid of all of the fragile parsing of hipchat messages from Jenkins.  It also
adds a command ("sun, state") which will print the aforementioned state for
debugging purposes.

Test Plan: Done some live testing, will do more after deploying for reals.

Reviewers: mroth, benjaminpollack

Reviewed By: benjaminpollack

Subscribers: csilvers

Differential Revision: https://phabricator.khanacademy.org/D21115

Khan/culture-cow,Khan/culture-cow