Removed AbstractHierarchicalFileConfiguration base class.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1464695 13f79535-47bb-0310-9956-ffa450edef68
Removed base class for tests of events related to file configurations.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1464696 13f79535-47bb-0310-9956-ffa450edef68