Use native cluster formation by default
Use native cluster formation by default

[#144893375]

Signed-off-by: Ben Chapman <4ada7eac694dcb4b5475ac51d142ba919b54bb00@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release