util: add print_msg() method to DaemonThread

it is used by at synchornizer.py, line 173

lib/util.py

@@ -47,6 +47,9 @@ class DaemonThread(threading.Thread):
     def print_error(self, *msg):
         print_error("[%s]" % self.__class__.__name__, *msg)
 
+    def print_msg(self, *msg):
+        print_msg("[%s]" % self.__class__.__name__, *msg)
+
 
 
 is_verbose = False