RemoteSC2Env updates   - Support an explicit lan_port list.   - Leave the game when closing the environment.   - Add logging around joining and leaving the game.
RemoteSC2Env updates
  - Support an explicit lan_port list.
  - Leave the game when closing the environment.
  - Add logging around joining and leaving the game.

PiperOrigin-RevId: 200578685

deepmind/pysc2