NCBC-599: Shuffle method changes server order resulting in NMV responses

Change-Id: I2bd8849c7ade587f9942ae7fc75cb148e7a6de9e
Reviewed-on: http://review.couchbase.org/40818
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>