routing+routerrpc: expose mission control parameters in lnd config

This commit exposes the three main parameters that influence mission
control and path finding to the user as command line or config file
flags. It allows for fine-tuning for optimal results.

server.go

@@ -38,6 +38,7 @@ import (
 	"github.com/lightningnetwork/lnd/lncfg"
 	"github.com/lightningnetwork/lnd/lnpeer"
 	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/nat"
@@ -639,8 +640,13 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB, cc *chainControl,
 		return link.Bandwidth()
 	}
 
+	// Instantiate mission control with config from the sub server.
+	//
+	// TODO(joostjager): When we are further in the process of moving to sub
+	// servers, the mission control instance itself can be moved there too.
 	s.missionControl = routing.NewMissionControl(
 		chanGraph, selfNode, queryBandwidth,
+		routerrpc.GetMissionControlConfig(cfg.SubRPCServers.RouterRPC),
 	)
 
 	s.chanRouter, err = routing.New(routing.Config{