routing: convert to use new kvdb abstraction

routing/missioncontrol.go

@@ -4,8 +4,8 @@ import (
 	"sync"
 	"time"
 
-	"github.com/coreos/bbolt"
 	"github.com/lightningnetwork/lnd/channeldb"
+	"github.com/lightningnetwork/lnd/channeldb/kvdb"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing/route"
 )
@@ -173,7 +173,7 @@ type paymentResult struct {
 }
 
 // NewMissionControl returns a new instance of missionControl.
-func NewMissionControl(db *bbolt.DB, cfg *MissionControlConfig) (
+func NewMissionControl(db kvdb.Backend, cfg *MissionControlConfig) (
 	*MissionControl, error) {
 
 	log.Debugf("Instantiating mission control with config: "+