To specify a logging configuration file

Setup of logging from a configuration file.
Refer to the following for the details of a configuration file.
http://docs.python.org/2/library/logging.config.html

Signed-off-by: Satoshi Kobayashi <satoshi-k@stratosphere.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>