Created LinkService and added unit tests.

Change-Id: I1f2104c873e5a9e2df34074d36cddc823e3b3ec5
diff --git a/incubator/protobuf/models/BUCK b/incubator/protobuf/models/BUCK
index 6bfac3d..99619ed 100644
--- a/incubator/protobuf/models/BUCK
+++ b/incubator/protobuf/models/BUCK
@@ -3,13 +3,15 @@
     '//lib:CORE_DEPS',
     ':onos-incubator-protobuf-models-proto',
     '//lib:protobuf-java-3.2.0',
-    '//lib:GRPC_1.3'
+    '//lib:GRPC_1.3',
+    '//incubator/grpc-dependencies:grpc-core-repkg-1.3.0'
 ]
 
 GRPC_DEPS = [
     '//lib:GRPC_1.3',
     '//lib:protobuf-java-3.2.0',
-    '//lib:guava'
+    '//lib:guava',
+    '//incubator/grpc-dependencies:grpc-core-repkg-1.3.0'
 ]
 
 BUNDLES = [