lnd: fully integrate the ChannelRouter of the new routing package

This commit fully integrates the ChannelRouter of the new routing
package into the main lnd daemon.

A number of changes have been made to properly support the new
authenticated gossiping scheme.

Two new messages have been added to the server which allow outside
services to: send a message to all peers possible excluding one, and
send a series of messages to a single peer. These two new capabilities
are used by the ChannelRouter to gossip new accepted announcements and
also to synchronize graph state with a new peer on initial connect.

The switch no longer needs a pointer to the routing state machine as it
no longer needs to report when channels closed since the channel
closures will be detected by the ChannelRouter during graph pruning
when a new block comes in.

Finally, the funding manager now crafts the proper authenticated
announcement to send to the ChannelRouter once a new channel has bene
fully confirmed. As a place holder we have fake signatures everywhere
since we don’t properly store the funding keys and haven’t yet adapted
the Signer interface (or create a new one) that abstracts out the
process of signing a generic interface.

log.go

@@ -10,6 +10,7 @@ import (
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/lnwallet"
+	"github.com/lightningnetwork/lnd/routing"
 )
 
 // Loggers per subsystem.  Note that backendLog is a seelog logger that all of
@@ -30,6 +31,7 @@ var (
 	utxnLog    = btclog.Disabled
 	brarLog    = btclog.Disabled
 	cmgrLog    = btclog.Disabled
+	crtrLog    = btclog.Disabled
 )
 
 // subsystemLoggers maps each subsystem identifier to its associated logger.
@@ -46,6 +48,7 @@ var subsystemLoggers = map[string]btclog.Logger{
 	"UTXN": utxnLog,
 	"BRAR": brarLog,
 	"CMGR": cmgrLog,
+	"CRTR": crtrLog,
 }
 
 // useLogger updates the logger references for subsystemID to logger.  Invalid
@@ -96,6 +99,10 @@ func useLogger(subsystemID string, logger btclog.Logger) {
 	case "CMGR":
 		cmgrLog = logger
 		connmgr.UseLogger(logger)
+
+	case "CRTR":
+		crtrLog = logger
+		routing.UseLogger(crtrLog)
 	}
 }