MB-100: fix node was not down after 30 sec

Change-Id: I39e4afe508ec1736391ad74f22d252accc6b6593
Reviewed-on: http://review.couchbase.org/25169
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>