Adds update_tasks for the minor update workflow. These will be
collected into playbooks during an initial 'update init' heat
stack update and then invoked later by the operator as ansible
playbooks.
Current understanding/workflow:
Step=1: stop the cluster on the updated node
Step=2: Pull the latest image and retag the it pcmklatest
Step=3: yum upgrade happens on the host
Step=4: Restart the cluster on the node
Step=5: Verification: test pacemaker services are running.
https://etherpad.openstack.org/p/tripleo-pike-updates-upgrades
Related-Bug: 1715557
Co-Authored-By: Damien Ciabrini <dciabrin@redhat.com>
Co-Authored-By: Sofer Athlan-Guyot <sathlang@redhat.com>
Change-Id: I101e0f5d221045fbf94fb9dc11a2f30706843806
a953bda0ae