DS-6993 Convert war used for overlay to web fragments

Hi Aaron,

As mentioned verbally yesterday I've converted the all the user agents to web fragments. Basically I moved the files to META-INF/resources and replace the web.xml by a fragment.xml,

The purpose of this change is to work around m2eclipse limitation that doesn't handle war dependencies in the Maven Dependencies classpath container. Converting them to web fragment allows me to put them into the classpath through maven dependency and configure jetty to use them in the web app.

Please drop me an email when done as I'll need to update also the dependencies of hothouse-iris project.

Cheers
Yann