OAK-2196 - Implement sorting based on Lucene sorting

Make use of DocValues for sorting based on Amit's approach.  orderedProps would be be stored in a separate field with DocVal type set.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1632017 13f79535-47bb-0310-9956-ffa450edef68