CBQE-1727: Install rebalance-in node before adding in offline upgrade

Change-Id: If7fc18bbaeb5140b19423cc8d51b8e458e51015a
Reviewed-on: http://review.couchbase.org/30786
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>