Measure the performance of evaluating whether to log or not to log,
but not actually logging.
This program takes two arguments, a string which should be
"true" for testing shipped code performance and "false" for testing
debug-enabled performance the second argument is the run length of
the measurement loops.
The results of the measurement (should) show that
Category evaluation is independent of the length of the category name.
As expected, using the isDebugEnabled and isInfoEnabled
methods eliminates the overhead of message argument construction.
Message argument construction can be an important slowing
factor while evaluating whether to log or not.