overcloud: Look for notCompute or controller

Update the nova list command which obtains the OVERCLOUD_ID
in devtest_overcloud.sh so that it supports the old and new
names of the controller (notCompute) nodes.

A step towards getting rid of notCompute for good.

Change-Id: I70ef83f35064ab388bdc7e1a6da62b6585580010
Partial-bug: #1300324
Merge "overcloud: Look for notCompute or controller"