CBQE-0 fix pick new master node after
upgrade from 3.0.1 to 3.x.x

Change-Id: I7139cdb515786ceae1ccccfdc5d3894bdc5e65c8
Reviewed-on: http://review.couchbase.org/43455
Reviewed-by: Thuan Nguyen <soccon@gmail.com>
Tested-by: Thuan Nguyen <soccon@gmail.com>