Adding build tools for gRPC compilation.
ONOS-6095

Change-Id: I80687eb2a91ad60c4dbec0bb966e917555d46151
diff --git a/incubator/rpc-grpc/src/main/proto/LinkService.proto b/incubator/rpc-grpc/src/main/proto/LinkService.proto
index 99e0f22..ee32453 100644
--- a/incubator/rpc-grpc/src/main/proto/LinkService.proto
+++ b/incubator/rpc-grpc/src/main/proto/LinkService.proto
@@ -1,7 +1,7 @@
 syntax = "proto3";
 option java_package = "org.onosproject.grpc.net.link";
 
-import "Link.proto";
+import "models/Link.proto";
 
 package Link;