start a single zone cluster with a realm:
OSD=1 MON=1 MDS=0 MGR=0 ../src/test/rgw/test-rgw-multisite.sh 1
create a persistent topic with a bucket and notifications:
aws --region=zg1 --endpoint-url http://localhost:8001 sns create-topic --name=fishtopic --attributes='{"push-endpoint": "kafka://localhost", "persistent": "true"}'
aws --region=zg1 --endpoint-url http://localhost:8001 s3 mb s3://fish
aws --region=zg1 --endpoint-url http://localhost:8001 s3api put-bucket-notification-configuration --bucket fish --notification-configuration='{"TopicConfigurations": [{"Id": "notif1", "TopicArn": "arn:aws:sns:default::fishtopic", "Events": []}]}'