fix logger propagate. test=develop. test=release/2.0 (#23983)

python/paddle/fluid/log_helper.py

@@ -49,4 +49,8 @@ def get_logger(name, level, fmt=None):
         handler.setFormatter(formatter)
 
     logger.addHandler(handler)
+
+    # stop propagate for propagating may print
+    # log multiple times
+    logger.propagate = False
     return logger