router: move self node out of config

We are going to use the config struct to allow getting and setting
of the mission control config in the commits that follow. Self node
is not something we want to change, so we move it out for better
separation.

routing/missioncontrol.go

@@ -78,7 +78,8 @@ type MissionControl struct {
 	// external function to enable deterministic unit tests.
 	now func() time.Time
 
-	cfg *MissionControlConfig
+	// selfNode is our pubkey.
+	selfNode route.Vertex
 
 	store *missionControlStore
 
@@ -122,9 +123,6 @@ type MissionControlConfig struct {
 	// since the previously recorded failure before the failure amount may
 	// be raised.
 	MinFailureRelaxInterval time.Duration
-
-	// SelfNode is our own pubkey.
-	SelfNode route.Vertex
 }
 
 // TimedPairResult describes a timestamped pair result.
@@ -177,8 +175,8 @@ type paymentResult struct {
 }
 
 // NewMissionControl returns a new instance of missionControl.
-func NewMissionControl(db kvdb.Backend, cfg *MissionControlConfig) (
-	*MissionControl, error) {
+func NewMissionControl(db kvdb.Backend, self route.Vertex,
+	cfg *MissionControlConfig) (*MissionControl, error) {
 
 	log.Debugf("Instantiating mission control with config: "+
 		"PenaltyHalfLife=%v, AprioriHopProbability=%v, "+
@@ -200,7 +198,7 @@ func NewMissionControl(db kvdb.Backend, cfg *MissionControlConfig) (
 	mc := &MissionControl{
 		state:     newMissionControlState(cfg.MinFailureRelaxInterval),
 		now:       time.Now,
-		cfg:       cfg,
+		selfNode:  self,
 		store:     store,
 		estimator: estimator,
 	}
@@ -262,7 +260,7 @@ func (m *MissionControl) GetProbability(fromNode, toNode route.Vertex,
 	results, _ := m.state.getLastPairResult(fromNode)
 
 	// Use a distinct probability estimation function for local channels.
-	if fromNode == m.cfg.SelfNode {
+	if fromNode == m.selfNode {
 		return m.estimator.getLocalPairProbability(now, results, toNode)
 	}