[#52299619] adding graphite and collectd

Initial work. DNS and server aliases need to be set so that it can be seen in
production
[#52299619] removing white space
[#52299619] match server set-up in prod
[#52299619] fixed typo of the management box for dns conf
[#52299619] collectd config to send to carbon & basic plugins
[#52299619] whitespace tidy
[#52299619] added further commentary
[#52299619] additional commentary
whitespace
[#52299619] moving graphite install directive to gds_graphite class
Merge pull request #11 from alphagov/metrics_collection

[#52299619] Add Metrics collection to CI Environment