(PUP-3260) Remove rrdgraph report processor
(PUP-3260) Remove RRD functionality from Metric class
(PUP-3260) Remove rrd directory permissions test
(PUP-3260) remove librrd-ruby from Debian deps
Merge pull request #3103 from adrienthebo/removal/master/pup-3260-remove-rrdgraph-report-processor

(PUP-3260) Remove RRD functionality