Some external (i.e. non-Kolla) container images can fail to launch on
Ubuntu with Podman, due to the absence of the catatonit package. For
example, this affects the prometheus/node-exporter container image.
This is a small package that we be installed by default in these
environments.
Closes-Bug: #2114998
Change-Id: Id5b92ac423671ba039bc478af829aafdd8548f9c
Signed-off-by: Pierre Riteau <pierre@stackhpc.com>