Upgrade to Archiva 2.1.1

* Update jetty.xml config from Archiva 2.x package
* Ensure Java 7 is, in fact, installed
    - Java 7 (aka JDK 1.7) is required by Archiva 2.x
* Ensure all 32-bit things are removed
    - Lifted from the [“official” Puppet module](https://github.com/maestrodev/puppet-archiva/blob/d64f752f0cb445b7190357757eb5e83201590f89/manifests/init.pp)