Restructure log setup a bit
Restructure log setup a bit

Add a note that peeking into the protected _levelNames variable is
necessary only until we support Python 2.6.

Change-Id: Id8d74acdbf43df05422d6dd84d5a526cd33b0a8e
Reviewed-by: Dave Reeve <6a84ee3ae0690d4584b99406fb3076392171f50e@morganstanley.com>

guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon,quattor/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon