Hack up swift default enum and test exprs to use the new drive claiming.
Merge pull request #80 from VictorLowther/pull-req-release-pebbles-master-b33d4f791a3432f0d3d2d4ea58a1c80f9ce6c95e

Rework how we allocate disks to barclamps. Will close DE1120 and DE1162. [3/8]