Nova AZ: Remove unused AdminPassword
Nova AZ: Remove unused AdminPassword

This is follow-up of ceed5ac9e71e7c4b113ffa8e16a8167190312b47 and
removes the AdminPassword parameter which is no longer used since we
replaced individual auth parameters by clouds.yaml.

Change-Id: I3ac42adee86aeba8b60d96bcdff7885551a175c6

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates