OAK-1233 - IllegalStateException in MergeSortedIterators

-- Using StableRevisionCompartor in NodeDocument as the requirement is same. Existing logic
   differed in handling of the clusterId comparison. This change would ensure that comparison
   logic is consistent
-- Added a description method to provide more details around which property access lead to the
   exception
-- Adding an ignored testcase with the runtime data captured from the system.
   This data causes the exception to be thrown

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1546019 13f79535-47bb-0310-9956-ffa450edef68
OAK-28 Query implementation (additional test)

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1546020 13f79535-47bb-0310-9956-ffa450edef68