Update ProtoBuf 3 & gRPC

- Protocol Buffers: 3.0.0
- gRPC: 1.0.0-pre2

Change-Id: Ic80d3f660d4a0aa37a99d4e6d4dc45e0b70b073b
diff --git a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/converter/DeviceEventConverter.java b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/converter/DeviceEventConverter.java
index 6b2ee24..6a2d1f3 100644
--- a/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/converter/DeviceEventConverter.java
+++ b/apps/kafka-integration/core/src/main/java/org/onosproject/kafkaintegration/converter/DeviceEventConverter.java
@@ -14,7 +14,8 @@
  */
 package org.onosproject.kafkaintegration.converter;
 
-import com.google.protobuf.GeneratedMessage;
+import com.google.protobuf.GeneratedMessageV3;
+
 import org.onosproject.event.Event;
 import org.onosproject.grpc.net.Device.DeviceCore;
 import org.onosproject.grpc.net.Device.DeviceType;
@@ -34,7 +35,7 @@
     private final Logger log = LoggerFactory.getLogger(getClass());
 
     @Override
-    public GeneratedMessage convertToProtoMessage(Event<?, ?> event) {
+    public GeneratedMessageV3 convertToProtoMessage(Event<?, ?> event) {
 
         DeviceEvent deviceEvent = (DeviceEvent) event;