DEVELOPER-1080 Added Data Virtualization version 6.1.0.ALPHA Jar file to dowloads

I switched the current version to the ALPHA release, so it is now the displayed download.  I can switch items around if we would like to have the general release available first and the alpha release after.  

Also, I didn't see any documentation or other files available to add to the download manager yet, but I can add them as well when they become available.
See: https://github.com/paulrobinson/www.jboss.org/blob/CONTRIBUTING/CONTRIBUTING.md#how-to-add-a-new-product-download