OAK-1414: Copying a large subtrees does not scale as expected in the number of copied nodes on document node stores
Removing exclusion as this test passed for the document fixture highly significant for the last couple of times

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1585665 13f79535-47bb-0310-9956-ffa450edef68