lnwallet/test: execute ifacet tests for each backend in parallel

lnwallet/test/btcd/btcd_test.go

@@ -0,0 +1,13 @@
+package btcd_test
+
+import (
+	"testing"
+
+	lnwallettest "github.com/lightningnetwork/lnd/lnwallet/test"
+)
+
+// TestLightningWallet tests LightningWallet powered by btcd against our suite
+// of interface tests.
+func TestLightningWallet(t *testing.T) {
+	lnwallettest.TestLightningWallet(t, "btcd")
+}