We have race conditions where a container can be removed
by two different processes when running podman --remove rm.
It can be cleaned up in the API or by the conmon executing
podman container cleanup.
When we fail to remove a container that does not exists we should
not be printing errors or warnings, we should just debug the fact.
[NO TESTS NEEDED] Since this is a race condition it is difficult to
test.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>