Remove duplicate file logger formatter setting

Change-Id: Ia7851a4266fa61658c48cc894163c6afb7252750

Author: kiwik

openstackclient/common/logs.py

@@ -173,8 +173,6 @@ def configure(self, cloud_config):
         if log_file:
             if not self.file_logger:
                 self.file_logger = logging.FileHandler(filename=log_file)
-            formatter = _FileFormatter(cloud_config=cloud_config)
-            self.file_logger.setFormatter(formatter)
             self.file_logger.setFormatter(_FileFormatter(config=cloud_config))
             self.file_logger.setLevel(log_level)
             self.root_logger.addHandler(self.file_logger)