@Bean
	@ConditionalOnMissingBean
	public EurekaDiscoveryClient discoveryClient(EurekaClient client, EurekaClientConfig clientConfig) {
		return new EurekaDiscoveryClient(client, clientConfig);
	}
@author Dave Syer
@author Spencer Gibb
@author Jon Schneider
@author Jakub Narloch
@author Olga Maciaszek-Sharma
@author Tim Ysewyn
spring-cloud-netflix-eureka-client/src/main/java/org/springframework/cloud/netflix/eureka/EurekaDiscoveryClientConfiguration.java