HA services get their container image name from a pacemaker
resource configuration. This image name is shared between
all cluster nodes.
To achieve image update without service disruption, a pacemaker
resource is configured to use an intermediate image name
"<registry>/<namespace>/<servicename>:pcmklatest" pointing to
the real image name configured in Heat. This tag can then be
updated independently on every node during the minor update.
In order to support the same rolling update when the <namespace>
changes in the container image, we need a similar floating
approach for the prefix part of the container image.
Introduce a new Heat parameter ClusterCommonTag that, when enabled,
sets the intermediate image name to
"cluster-common-tag/<servicename>:pcmklatest". By default, this
parameter is disabled and the original naming scheme is conserved.
Note: by introducing this new naming scheme, we stop seeing a
meaningful image name prefix when doing a "pcs status", but since
we already can't tell what image ID the :pcmklatest tag points to,
we don't lose much information really.
Related-Bug: #1854730
Change-Id: Id369154d147cd5cf0a6f997bf806084fc7580e01
(cherry picked from commit a166ec6bca)
(cherry picked from commit 44b6e6b852)
f366adbd15