routing: add validation of utxo

Add check that the edge that was received really exist in the blockchain
and that the announced funding keys and capcity corresponds to reality.

routing/router_test.go

@@ -6,8 +6,10 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/channeldb"
+	"github.com/roasbeef/btcd/wire"
+
+	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/roasbeef/btcd/btcec"
 	"github.com/roasbeef/btcutil"
@@ -46,7 +48,7 @@ func createTestCtx(startingHeight uint32, testGraph ...string) (*testCtx, func()
 			return nil, nil, fmt.Errorf("unable to create test graph: %v", err)
 		}
 
-		sourceNode, err = createGraphNode()
+		sourceNode, err = createTestNode()
 		if err != nil {
 			return nil, nil, fmt.Errorf("unable to create source node: %v", err)
 		}