Removed obsolete Reloadable interface.

After the redesign of the reloading mechanism this interface is no longer
needed.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1511078 13f79535-47bb-0310-9956-ffa450edef68
Removed obsolete Lock class.

After the redesign of synchronization and concurrent access this class is no
longer needed.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1511079 13f79535-47bb-0310-9956-ffa450edef68