This was already supported for Syslog, but not for the BufferedLogger
class. Also add an option to disable the context logging.
This also fixes a bug where the session logging was always using the
default session cookie name (_normandy_session), rather than the
configured one.
refs #5094
Change-Id: I4c8389f1051a70c25a92bfe018044cd15f45422b
Reviewed-on: https://gerrit.instructure.com/4795
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Hudson <hudson@instructure.com>