Use multiple parameters to logging method rather than % operator.

This reduces the cost of invoking log method when the log line is not to
be emitted.
Also, don't put a space before a colon.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1684 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/app.py

@@ -160,7 +160,7 @@ class Application(object):
                         self.operational = False
 
             except PrimaryFailure, msg:
-                logging.error('primary master is down : %s' % msg)
+                logging.error('primary master is down: %s', msg)
 
     def connectToPrimary(self):
         """Find a primary master node, and connect to it.