Make RemoveContainer return containers and pods removed

This allows for accurate reporting of dependency removal, but the
work is still incomplete: pods can be removed, but do not report
the containers they removed as part of said removal. Will add
this in a subsequent commit.

Major note: I made ignoring no-such-container errors automatic
once it has been determined that a container did exist in the
first place. I can't think of any case where this would not be a
TOCTOU - IE, no reason not to ignore them. The `--ignore` option
to `podman rm` should still retain meaning as it will ignore
errors from containers that didn't exist in the first place.

Signed-off-by: Matthew Heon <matthew.heon@pm.me>

libpod/runtime_pod_common.go

@@ -142,7 +142,8 @@ func (r *Runtime) removeMalformedPod(ctx context.Context, p *Pod, ctrs []*Contai
 				ctrNamedVolumes[vol.Name] = vol
 			}
 
-			return r.removeContainer(ctx, ctr, force, false, true, true, false, false, timeout)
+			_, _, err := r.removeContainer(ctx, ctr, force, false, true, true, false, false, timeout)
+			return err
 		}()
 
 		if removalErr == nil {