added static method CsstMsDataManager.clear_dir()

csst_common/data_manager.py

@@ -506,6 +506,10 @@ class CsstMsDataManager:
         """ Remove L1 (sub-)directory. """
         os.system(f"rm -rf {os.path.join(self.dir_l1, dir_name)}")
 
+    @staticmethod
+    def clear_dir(dir_path):
+        os.system(f"rm -rf {dir_path}/*")
+
     # DFS interfaces
     @property
     def dfs_node(self):