DERBY-6256: Commit derby-6256-01-aa-move-XmlVTI-into-product.diff, moving the XmlVTI into the vti package of the product.

git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/trunk@1490799 13f79535-47bb-0310-9956-ffa450edef68