Fix IPv6-related bug in SDN-IP.

 - Use the correct API to set an IPv6 prefix in the matching condition

Change-Id: I7911a7e886024bff5442821816e4481570ec8172

@@ -317,10 +317,11 @@ public class IntentSynchronizer implements FibListener {
         TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
         if (prefix.version() == Ip4Address.VERSION) {
             selector.matchEthType(Ethernet.TYPE_IPV4);
+            selector.matchIPDst(prefix);
         } else {
             selector.matchEthType(Ethernet.TYPE_IPV6);
+            selector.matchIPv6Dst(prefix);
         }
-        selector.matchIPDst(prefix);
 
         // Rewrite the destination MAC address
         TrafficTreatment.Builder treatment = DefaultTrafficTreatment.builder()

@@ -574,10 +574,11 @@ public class IntentSyncTest extends AbstractIntentTest {
                 DefaultTrafficSelector.builder();
         if (ipPrefix.version() == Ip4Address.VERSION) {
             selectorBuilder.matchEthType(Ethernet.TYPE_IPV4);   // IPv4
+            selectorBuilder.matchIPDst(ipPrefix);
         } else {
             selectorBuilder.matchEthType(Ethernet.TYPE_IPV6);   // IPv6
+            selectorBuilder.matchIPv6Dst(ipPrefix);
         }
-        selectorBuilder.matchIPDst(ipPrefix);
 
         TrafficTreatment.Builder treatmentBuilder =
                 DefaultTrafficTreatment.builder();