Add steps to multinode-overcloud-update.yml playbook which are required
before running full minor update on overcloud. The prerequisites for
starting overcloud update for tripleo-upgrade are:
- updated dlrn repos definitions on overcloud nodes
- updated containers-prepare-parameter.yaml file on undercloud
Resolves: #2015993
Depends-On: https://review.opendev.org/c/openstack/tripleo-ci/+/880162
Depends-On: https://review.opendev.org/c/openstack/tripleo-quickstart/+/883307
Change-Id: I2829307d1013e96317338eccc7a4b16376fb1d2b