Remove waiting after partially failed failover.

It was introduced e9e35b795d07b7800ca525a2ab30f1250364ccda. The
motivation doesn't apply anymore since we moved replicators to
destination nodes. Moreover, it was effectively disabled by another
change that introduced master events.

Change-Id: I3e6ed49de35bbdd2bdaa2449a133ca2f06b5f59f
Reviewed-on: http://review.couchbase.org/33810
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>