multi: add max local csv config option

To allow nodes more control over the amount of time that their funds
will be locked up, we add a MaxLocalCSVDelay option which sets the
maximum csv delay we will accept for all channels. We default to the
existing constant of 10000, and set a sane minimum on this value so that
clients cannot set unreasonably low maximum csv delays which will result
in their node rejecting all channels.

server.go

@@ -1174,6 +1174,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 		MaxChanSize:                   btcutil.Amount(cfg.MaxChanSize),
 		MaxPendingChannels:            cfg.MaxPendingChannels,
 		RejectPush:                    cfg.RejectPush,
+		MaxLocalCSVDelay:              chainCfg.MaxLocalDelay,
 		NotifyOpenChannelEvent:        s.channelNotifier.NotifyOpenChannelEvent,
 		OpenChannelPredicate:          chanPredicate,
 		NotifyPendingOpenChannelEvent: s.channelNotifier.NotifyPendingOpenChannelEvent,