doc: include article about libvirt+audit in relatedlinks.html

This patch adds to relatedlinks.html a link to an article about libvirt
describing how the Linux audit subsystem can be used to track qemu
guest's life-cycle.

docs/relatedlinks.html.in

@@ -59,6 +59,9 @@
       <li>
         <a href="http://en.wikipedia.org/wiki/Virtualization">Wikipedia Virtualization</a>
       </li>
+      <li>
+        <a href="http://www.ibm.com/developerworks/linux/library/l-kvm-libvirt-audit/index.html">IBM developerworks article about libvirt and audit.</a>
+      </li>
     </ul>
 
     <h2>Blogs and Podcasts</h2>