MB-100: expire_time is too large in online_upgrade_rebalance_in_out

Change-Id: I6b085c98fbcddc4871c4110ed32741b65d056683
Reviewed-on: http://review.couchbase.org/24945
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>