Always include step tasks in external update/upgrade
Always include step tasks in external update/upgrade

This is now a prerequisite so that we can run external update/upgrade
with --tags parameter and have it do something. (I don't recall this
being necessary before, i suspect the change may have become necessary
with a bump in Ansible version, or some refactoring in t-h-t.)

Change-Id: I10356e49ad6fb200e6a419ab5dc562f274ae6f8d
Implements: blueprint upgrades-with-os

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