Filter out duplicate ips in lookup #315

Job	Run time
Prepare	8s
Test (GODOG_FEATURE=00_cluster_smoke make test)	4m 52s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 33s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	6m 54s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	8m 34s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 21s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 41s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	8m 20s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 24s
Test (GODOG_FEATURE=04_cluster_failover make test)	20m 44s
Test (GODOG_FEATURE=04_sentinel_failover make test)	19m 41s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	6m 18s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	5m 32s
Test (GODOG_FEATURE=06_cluster_lost make test)	2m 53s
Test (GODOG_FEATURE=06_sentinel_lost make test)	2m 46s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	13m 53s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	18m 51s
	2h 19m 25s

Provide feedback