Add the Nova Compute role

Change-Id: I6019a0d83ee45a5070d5f1c4a4dfb4927badc33d
fixes

Change-Id: I77ed90b852cecd624ecf4f75a4f8034e13ebe1d8
use consistent names for the roles

Change-Id: Ifd961c2299edc75a303d4a94723cab9124d67c12