[FAILING] test to illustrate clone behaviour of node with versionable child

This might not be good to merge, but illustrates the expected behaviour of cloning a node that has a versionable child. See the discussion here:

[Re: Preview workflow based on workspace clone/node update](http://www.mail-archive.com/users@jackrabbit.apache.org/msg19369.html)

The test fails using Jackrabbit 2.6; I was expecting the child of the cloned node to be skipped, but it was cloned into the destination workspace along with its parent.