Removed special treatment of Reloadable objects from ConfigurationUtils.

The Reloadable interface is no longer implemented by any Configuration class.
It is no longer needed after the reloading mechanism was rewritten.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1511077 13f79535-47bb-0310-9956-ffa450edef68