Add Ubuntu 12.04 LTS (Precise Pangolin) (PVHVM) flavor to Rackspace IAD

Change-Id: I2b22033a14708f340516da7076fe21b1ccb31d64

Lower min-ready across jenkins, add rax-iad

Change-Id: I2b22033a14708f340516da7076fe21b1ccb31d64