@ModuleOption("the username to use to connect to the broker")
	public void setUsername(String username) {
		this.username = username;
	}
Factors out options for the typical connection setup to RabbitMQ.

@author Eric Bottard
@author Gary Russell
@author Glenn Renfro
@author Gary Russell
@author David Turanski
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/RabbitConnectionMixin.java