OAK-1861: Limit memory usage of DocumentNodeStore.readChildren()

Ignore test for now as it fails with update.limit=100 used by maven build. Test succeeds with default update.limit=10000

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1606641 13f79535-47bb-0310-9956-ffa450edef68
OAK-1861: Limit memory usage of DocumentNodeStore.readChildren()

Fix test and enable again.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1606644 13f79535-47bb-0310-9956-ffa450edef68