log info for config file

lib/OperationalLogger.py

@@ -215,10 +215,12 @@ def setup(config_file=None, logger_name=None, log_filename=None, log_root_dir=No
         if not os.path.exists(config_file):
             logging.warn("Could not find logging config file: %s", config_file)
         else:
+            logging.debug("Loading logging config from: %s", config_file)
             with open(config_file, 'r') as f:
                 loaded_config = json.load(f)
             for key, val in loaded_config.items():
                 if key in config and val is None:
+                    logging.debug("- setting option from file: %s --> %s", key, val)
                     config[key] = val
     # Set reasonable defaults for remaining Nones.
     if config['log_filename'] is None: