SpringBoot Provide a property for configuring Spring AMQP's address shuffle mode

This support connecting to RabbitMQ clustered host addresses with shuffling. https://docs.spring.io/spring-amqp/reference/html/#cluster

Because of shuffle-addresses mode is deprecated, i have added addressShuffleMode property which is String. Please review and comment. Thanks.

Comment From: 01045972746

@snicoll , i have edited what you mention. please re-review plz.

Comment From: snicoll

@01045972746 thank you for making your first contribution to Spring Boot. I've polished your contribution and added a test.