Since Rocky, the Undercloud is also containerized. The way to
tell the undercloud which containers to use is by setting the
right registry in containers-prepare-parameters.yaml file.
This patch adds a new role named container-update which makes use
of the parameters set in container-prep and substitute the relevant
parameters inside containers-prepare-parameter.yaml file. The input
for the role is the file used to configure the ContainerImagePrepare
environment variable (defaults to containers-prepare-parameter.yaml).
As part of the patch, it's been added a call to the newly added repo
container-update into multinode-undercloud-upgrade.yaml playbook to
update all needed parameters in containers-prepare-parameter.yaml
before the Undercloud's upgrade.
Change-Id: Icd4553f7c236080ebc529079142110a0b2e0ac2d
3a47baff8d