Add user-supplied arguments in log_handler

When using PublishErrorsHandler, it will missing user-supplied
arguments. For example, do LOG.info("blabla %s", "foo"),
the payload only contains "blabla %s", but we expect it like
"blabla foo". this bug has been fixed in oslo, just syncs it to
ceilometer.
Sync from Oslo, change-id: I91289cc4a60f5dab89bca852e6f52b4b83831e47

Change-Id: Ic2773035f6899e1ba7ec2813f79bd271dfa36b97
Merge "Add user-supplied arguments in log_handler"