Fix for pep8 E722 and ignore E741

New flake8 release causes these to suddenly show up.

Change-Id: If7fa5a549a2e1651d0353defcc910374bdd226c2

zuul/lib/log_streamer.py

@@ -108,7 +108,7 @@ class RequestHandler(socketserver.BaseRequestHandler):
             if log is not None:
                 try:
                     log.file.close()
-                except:
+                except Exception:
                     pass
             while True:
                 log = self.chunk_log(log_file)