host source should only add hosts if it is not known to the ring
host source should only add hosts if it is not known to the ring

mailgun/gocql,gus/gocql,mailgun/gocql,CrowdSurge/gocql,aai/gocql,nikandfor/gocql,i/gocql,vrischmann/gocql,vrischmann/gocql,gocql/gocql,Zariel/gocql,aai/gocql,CrowdSurge/gocql,ChannelMeter/gocql,Zariel/gocql,gus/gocql,nikandfor/gocql,znly/gocql,revinate/gocql,revinate/gocql,ChannelMeter/gocql,gocql/gocql,i/gocql,znly/gocql,nikandfor/gocql