MB-7168: try timeout 30 sec after failover, befor reb

Change-Id: Ib2acb0c31ee780650479a713b3309ca068f39d09
Reviewed-on: http://review.couchbase.org/24340
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>