Initial kitchen-salt commit
Initial commit to enable metrics formula testing.
Forgot to add these files into previous commit.
Added graphite integration tests
Adding some basic collectd tests.
Added tests to grafana. Small modifications of collectd tests.
Merge pull request #27 from ministryofjustice/kitchen-salt

Kitchen salt
Allow specification of graphite.data_dir

Previously we were hardcoded to use /srv/graphite/storage, which can
wind up filling the root fs.

Allow relocation to whereever, but this ideally should be /data/graphite
for consistency.

NB: this does not handle migration of your data from the old to the new location.
    See UPGRADING.md for instructions on how to do this.