Fix missing commas in kolla_podman_worker

List of strings CONTAINER_PARAMS is missing comma separators,
which makes it an implicit concatenation of list items
that should be separate.

Closes-Bug: #2067278
Change-Id: Iec9a8de184481dae058377fa8d7bbd8da729d62c
Signed-off-by: Martin Hiner <martin.hiner@tietoevry.com>