checkForEndpointCollision should ignore joining nodes

ERROR 00:04:50 Exception encountered during startup
java.lang.RuntimeException: A node with address bw-3/10.208.8.63 already exists, cancelling join. Use cassandra.replace_address if you want to replace this node.
    at org.apache.cassandra.service.StorageService.checkForEndpointCollision(StorageService.java:453) ~[main/:na]
    at org.apache.cassandra.service.StorageService.prepareToJoin(StorageService.java:666) ~[main/:na]
    at org.apache.cassandra.service.StorageService.initServer(StorageService.java:614) ~[main/:na]
    at org.apache.cassandra.service.StorageService.initServer(StorageService.java:507) ~[main/:na]
    at org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:338) [main/:na]
    at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:457) [main/:na]
    at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:546) [main/:na]