Update a per-dir example that's meant to show looping and the L flag.

* add a RewriteBase
* REQUEST_URI doesn't have the RewriteBase stripped from it, so fix the test comparison.
* rewrite to absolute URI and use PT flag so the rule is somewhat applicable to per-vh context



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1025748 13f79535-47bb-0310-9956-ffa450edef68