title: zuul add extra prefix for each eureka service ids
body: <p>Currently I have hardcoded my IP in zuul properties files </p>
  
  <pre><code>zuul.routes.userdomain.path=/oldusers/**
  zuul.routes.userdomain.url=http://olduser_server_ip:4545/oldusers/v1/oldlist
  </code></pre>
  
  <p>Now I have added Eureka and enabled Service discovery in zuul, now I  want to configure like below </p>
  
  <pre><code>zuul.routes.userdomain.path=/oldusers/**
  zuul.routes.userdomain.serviceId=OLD-USER-SERVICE
  </code></pre>
  
  <p>but in this how to add extra prefix <strong>'v1/oldlist'</strong> ? </p>
  
  <p>I can not use zuul.prefix because,  I have some more services with different prefixes</p>