Always use the utility host for service setup tasks
Always use the utility host for service setup tasks

This used to be discretionary at the choice of the operator but
making it the default gives certainty about the python version used
and that suitable python modules are available for the interpreter
used by ansible on the service setup host.

Change-Id: Ib1160a4b84292595f18b5cb47e19e15c33b081ab

stackforge/os-ansible-deployment,openstack/openstack-ansible,openstack/openstack-ansible,stackforge/os-ansible-deployment