Better define conditions for skipping tests on 2.4.x or non-2.4.x.
Use YAML anchors and references to avoid copy&pasting, hopefully 
the syntax remains reasonably readable.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1875540 13f79535-47bb-0310-9956-ffa450edef68
