Do not remove Outbound Channel immediately when peer disconnects

Do not remove Outbound Channel immediately when peer disconnects

- Do not remove channel immediately when peer_disconnect, instead
  removed it after some time if peer doesn't reconnect soon (handled in
previous commit).
- Do not mark per ok_to_remove if we have some OutboundV1Channels too.
- Rebroadcast SendOpenChannel for outboundV1Channel when peer
  reconnects.
- Update the relevant tests to account for the behavior change.
- Repurpose the test_disconnect_in_funding_batch to test that all
  channels in the batch close when one them closes.