The Spring Boot's `RabbitProperties` populates the `host:port`
(default values) to the addresses property in the `determineAddresses()`.
This way we override provided by Cloud Connectors `host:port`
* Do not populated `addresses` to the CCF from the `RabbitProperties`
if the real `addresses` is null.
Only explicit `spring.rabbitmq.addresses` application property will have
effect
**Cherry-pick to 1.3.x**
cc354cbd7d