Obtain elasticsearch address from pillar
Set default syslog to monitoring.local
Moved IPtables filter to bottom to avoid parse errors on syslog
Set all default hosts to monitoring.local (set to 127.0.0.1 in /etc/hosts if desired)
Merge pull request #3 from ministryofjustice/es_from_pillar

Elasticsearch tidyup
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