MB-11451: fixed message on Fail Over node

Change-Id: Ibff0af9dacc2328cb2e5730c92e088778eaca498
Reviewed-on: http://review.couchbase.org/39411
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>