Fix confetty live reconnect behavior

If on a remote socket, socket.error could be thrown.  A mistake was
made where the Python2.x behavior of ',' on an except clause without
parenthesis misinterpreted socket.error as a variable name to store
instance of socket.gaierror.  Put Parentheses in to declare the desired
behavior.

confluent_client/bin/confetty

@@ -642,7 +642,7 @@ while inconsole or not doexit:
                         try:
                             server_connect()
                             connected = True
-                        except socket.gaierror, socket.error:
+                        except (socket.gaierror, socket.error):
                             pass
                         if not connected:
                             time.sleep(1)