update env to use IPv6 address (#591)

Default host and local-ip to use the IPv6 address rather
than the IPv4 address.

Author: brharrington

iep-dynconfig/src/main/resources/reference.conf

@@ -29,12 +29,10 @@ netflix.iep.env {
   instance-id = ${?TITUS_TASK_INSTANCE_ID}
   instance-id = ${?NETFLIX_INSTANCE_ID}
 
-  local-ip = "127.0.0.1"
-  local-ip = ${?EC2_LOCAL_IPV4}
+  local-ip = "::1"
+  local-ip = ${?NETFLIX_IPV6}
 
-  host = "localhost"
-  host = ${?EC2_LOCAL_IPV4}
-  host = ${?EC2_PUBLIC_HOSTNAME}
+  host = "["${netflix.iep.env.local-ip}"]"
 
   account-id = "unknown"
   account-id = ${?EC2_OWNER_ID}

iep-dynconfig/src/test/java/com/netflix/iep/config/NetflixEnvironmentTest.java

@@ -15,12 +15,15 @@
  */
 package com.netflix.iep.config;
 
+import org.junit.Assert;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
+import java.net.Inet6Address;
+import java.net.InetAddress;
 
 @RunWith(JUnit4.class)
 public class NetflixEnvironmentTest {
@@ -43,4 +46,12 @@ public void checkMethods() throws Exception {
       Thread.currentThread().setContextClassLoader(cl);
     }
   }
+
+  @Test
+  public void hostAndIPv6() throws Exception {
+    String host = ConfigManager.get().getString("netflix.iep.env.host");
+    String ip = host.substring(1, host.length() - 1);
+    InetAddress addr = InetAddress.getByName(ip);
+    Assert.assertTrue(addr instanceof Inet6Address);
+  }
 }