change default log perms to 750/sgid

lib/OperationalLogging.py

@@ -164,7 +164,8 @@ def setup(config_file=None, logger_name=None, log_filename=None, log_root_dir=No
     log_directory = os.path.join(log_root_dir, 'log', datetime.datetime.utcnow().strftime('%Y-%m-%d'))
     if not os.path.exists(log_directory):
         try:
-            os.makedirs(log_directory, 0755)
+            # default log dir permissions: SGID bit + rwxr-x---
+            os.makedirs(log_directory, 02750)
         except OSError:
             logging.warn('Unable to create log directory %s', log_directory)
     if notify is None: