added ipAddress to ServiceInstance

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/client/ServiceInstance.java

@@ -8,5 +8,6 @@ package org.springframework.cloud.client;
 public interface ServiceInstance {
     public String getServiceId();
     public String getHost();
+    public String getIpAddress();
     public int getPort();
 }

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/EurekaDiscoverClient.java

@@ -26,6 +26,11 @@ public class EurekaDiscoverClient implements DiscoveryClient {
                 return config.getHostname();
             }
 
+            @Override
+            public String getIpAddress() {
+                return config.getIpAddress();
+            }
+
             @Override
             public int getPort() {
                 return config.getNonSecurePort();

spring-cloud-netflix-core/src/main/java/org/springframework/cloud/netflix/ribbon/RibbonLoadBalancerClient.java

@@ -44,6 +44,11 @@ public class RibbonLoadBalancerClient implements LoadBalancerClient {
             return server.getHost();
         }
 
+        @Override
+        public String getIpAddress() {
+            return null; //TODO: ribbon doesn't supply ip
+        }
+
         @Override
         public int getPort() {
             return server.getPort();