Switch from poking at services to waiting on heat.

Heat wait conditions are semantic rather than 'oh look it seems to
work' which allow us to avoid race conditions much more easily than
super-careful retries on every API. At least for now, this is
preferrable as we don't have a stable base on which to iterate.

Change-Id: I6a625167e747bb57d0887f1ced79661fbb147477
Remove Tim miller from tripleo-cd-admins.

He's not active at the moment.

Change-Id: I12697c35762ccfc82c13b876b6c725315229c019
Merge "Switch from poking at services to waiting on heat."
Merge "Remove Tim miller from tripleo-cd-admins."