[CORD-638] ICMPv6 NDP support

Changes:
- Adds the support for the ND protocol;
- Changes in several places Ip4Address and Ip4Prefix for general objects;

Change-Id: I7429b8f4acc9ffe432b49b66e66da50045996f7c
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/cli/DeviceSubnetListCommand.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/cli/DeviceSubnetListCommand.java
index da3dd1c..eca9c45 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/cli/DeviceSubnetListCommand.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/cli/DeviceSubnetListCommand.java
@@ -41,9 +41,7 @@
     private void printDeviceSubnetMap(Map<DeviceId, Set<IpPrefix>> deviceSubnetMap) {
         deviceSubnetMap.forEach(((deviceId, ipPrefices) -> {
             print("%s", deviceId);
-            ipPrefices.forEach(ipPrefix -> {
-                print("    %s", ipPrefix);
-            });
+            ipPrefices.forEach(ipPrefix -> print("    %s", ipPrefix));
         }));
     }
 }