docker: cleanup update tasks
docker: cleanup update tasks

Update tasks moved to the Ansible role itself, we don't need them in
THT. Let's do some cleanup.

Change-Id: I2f5bc355d3c952e2daf9ec7442850e24bed275e1

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