routing: add time_pref parameter to queryroutes and sendpayment

routing/payment_session_test.go

@@ -212,6 +212,7 @@ func TestRequestRoute(t *testing.T) {
 	session.pathFinder = func(
 		g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
 		source, target route.Vertex, amt lnwire.MilliSatoshi,
+		timePref float64,
 		finalHtlcExpiry int32) ([]*channeldb.CachedEdgePolicy, error) {
 
 		// We expect find path to receive a cltv limit excluding the