Change number_of_drives and physical_disks to be accurate.
Merge pull request #524 from VictorLowther/pull-req-release-pebbles-master-b33d4f791a3432f0d3d2d4ea58a1c80f9ce6c95e

https://github.com/crowbar/barclamp-crowbar/pull/524

Merged by devtool for cloudsleuth