Add debug() function to khepri cmd and lib

cmd/khepri/debug.go

@@ -26,7 +26,7 @@ func initDebugLogger() *log.Logger {
 
 	// open logger
 	l := log.New(io.MultiWriter(os.Stderr, f), "DEBUG: ", log.LstdFlags)
-	fmt.Fprintf(os.Stderr, "logging activated, writing log file %s", filename)
+	fmt.Fprintf(os.Stderr, "logging activated, writing log file %s\n", filename)
 	l.Printf("khepri %s", version)
 
 	return l