CBQE-1621 add move node between zone/rack function

Change-Id: I562413224dba9d5baec9bfca3ffdfdec96de46ab
Reviewed-on: http://review.couchbase.org/30331
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>