podman port

podman port reports the port mappings per container.  it can be used
to report the ports ofa single container or latest container or all
containers.

in the case of a single container, the user can add an option filter for
port and protocol.

Signed-off-by: baude <bbaude@redhat.com>

cmd/podman/main.go

@@ -57,6 +57,7 @@ func main() {
 		mountCommand,
 		pauseCommand,
 		psCommand,
+		portCommand,
 		pullCommand,
 		pushCommand,
 		rmCommand,