Update ProtoBuf 3 & gRPC

- Protocol Buffers: 3.0.0
- gRPC: 1.0.0-pre2

Change-Id: Ic80d3f660d4a0aa37a99d4e6d4dc45e0b70b073b
diff --git a/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java b/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
index 2d51c7c..26f16f5 100644
--- a/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
+++ b/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
@@ -16,13 +16,14 @@
 
 import org.onosproject.event.AbstractEvent;
 
-import com.google.protobuf.GeneratedMessage;
+import com.google.protobuf.GeneratedMessageV3;
 
 /**
  * Represents the converted Onos Event data into protobuf format.
  *
  */
-public class OnosEvent extends AbstractEvent<OnosEvent.Type, GeneratedMessage> {
+// FIXME lack of abstraction in subject type is biting us
+public class OnosEvent extends AbstractEvent<OnosEvent.Type, GeneratedMessageV3> {
 
     /**
      * Creates a new Onos Event.
@@ -30,7 +31,7 @@
      * @param type The Type of Onos Event
      * @param subject Protobuf message corresponding to the Onos Event
      */
-    public OnosEvent(Type type, GeneratedMessage subject) {
+    public OnosEvent(Type type, GeneratedMessageV3 subject) {
         super(type, subject);
     }