VivaldiTest: add node to _all(the list of live nodes) only after it joins. Also, ignores 0 rtt measurement
VivaldiTest: add node to _all(the list of live nodes) only after it joins. Also, ignores 0 rtt measurement

sit/dht,sit/dht,weidezhang/dht,sit/dht,weidezhang/dht,sit/dht,weidezhang/dht,weidezhang/dht,sit/dht,weidezhang/dht