Replace supervisord with upstart.

We were already using upstart for logstash-indexer it turned out, this
just replaces the other service we created, beaver, to use upstart too.

External changes that could affect people:
- There is no longer a `supervisord: supervise-beaver` state, it is now
  `service: beaver`
Replace supervisord with upstart.

We were already using upstart for logstash-indexer it turned out, this
just replaces the other service we created, beaver, to use upstart too.

External changes that could affect people:
- There is no longer a `supervisord: supervise-beaver` state, it is now
  `service: beaver`
Merge branch 'upstart' of github.com:ministryofjustice/logstash-formula into upstart
Updated beaver service.running defn
Remove supervisor config
Multiple switches incorrectly defined
Restart beaver service when init conf changes
Fix bad copy paste

Don't attribute it to Alex, I copied one he built but he didn't write this
Merge pull request #4 from ministryofjustice/replace_upstart

Replace supervisor with upstart