contextId的使用一般是调用同一个服务，但是分多个接口

比如调用同一个member服务可以通过contextId来区分开，否则就会报错bean冲突

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/**
 * @author 小五
 */
@FeignClient(contextId = "MemberAFeign", value = ServiceNameConstants.MEMBER_SERVICE,
        fallbackFactory = MemberFeignAFallbackFactory.class)
public interface MemberAFeign {
	...
}
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/**
 * @author 小五
 */
@FeignClient(contextId = "MemberBFeign", value = ServiceNameConstants.MEMBER_SERVICE,
        fallbackFactory = MemberFeignBFallbackFactory.class)
public interface MemberBFeign {
	...
}