Binary cache files for sympa.conf/rebot.conf are useless
Created by: ikedas
As sympa.conf/robot.conf won't be reloaded by current version, binary cache for these files are useless. Fixed by not checking updates on these files. Worse, even if a new parameter was added, cached configuration will be used and new parameter will be undefined instead of default value.
For example see issue #280 (closed).
This PR removes feature of binary cache for sympa.conf/robot.conf.