lnd: move main method to cmd/lnd/main.go

cmd/lnd/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	flags "github.com/jessevdk/go-flags"
+	"github.com/lightningnetwork/lnd"
+)
+
+func main() {
+	// Call the "real" main in a nested manner so the defers will properly
+	// be executed in the case of a graceful shutdown.
+	if err := lnd.Main(); err != nil {
+		if e, ok := err.(*flags.Error); ok && e.Type == flags.ErrHelp {
+		} else {
+			fmt.Fprintln(os.Stderr, err)
+		}
+		os.Exit(1)
+	}
+}