Update ProtoBuf 3 & gRPC

- Protocol Buffers: 3.0.0
- gRPC: 1.0.0-pre2

Change-Id: Ic80d3f660d4a0aa37a99d4e6d4dc45e0b70b073b
diff --git a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java
index 460b779..929881c 100644
--- a/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java
+++ b/incubator/rpc-grpc/src/main/java/org/onosproject/incubator/rpc/grpc/StubLinkProvider.java
@@ -19,7 +19,7 @@
 import org.onosproject.net.provider.AbstractProvider;
 import org.onosproject.net.provider.ProviderId;
 
-import com.google.api.client.repackaged.com.google.common.annotations.Beta;
+import com.google.common.annotations.Beta;
 import com.google.common.base.MoreObjects;
 
 /**