Removed HierarchicalReloadableConfiguration class.

Reloading is now handled differently, therefore this base class is no longer
needed.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1489152 13f79535-47bb-0310-9956-ffa450edef68
Removed getReadLock() method.

This method was part of the old reloading implementation. Reloading has been
completely redesigned, therefore this method is no longer needed.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1489154 13f79535-47bb-0310-9956-ffa450edef68