Remove obsolete global service password.
Remove obsolete global service password.

This is no longer used - it didn't fit the keystone modelling of
services, and with the services fixed there is no need for this
anymore.

Change-Id: Ie0f9a05202aa70f9b599b3767fd68460ec35a24d

openstack/tripleo-image-elements,radez/tripleo-image-elements,radez/tripleo-image-elements,agroup/tripleo-puppet-elements,agroup/tripleo-puppet-elements,openstack/tripleo-image-elements,agroup/tripleo-puppet-elements,rdo-management/tripleo-image-elements,rdo-management/tripleo-image-elements,agroup/tripleo-puppet-elements