ganglia-logtailer: shouldnt initialize logging when run with --help

[sandrotosi]

i was trying to have the cli options by running g-l with --help but i got an error instead:

./ganglia-logtailer --help
Traceback (most recent call last):
  File "/yada/yada/ganglia-logtailer", line 50, in <module>
    os.mkdir(logDir)
OSError: [Errno 13] Permission denied: '/var/log/ganglia'

this was with my user, so of course it couldnt create that dir nor access it.

I think g-l shouldnt try to initialize/read logging if only run via --help