Adding build tools for gRPC compilation.
ONOS-6095

Change-Id: I80687eb2a91ad60c4dbec0bb966e917555d46151
diff --git a/incubator/rpc-grpc/src/main/proto/DeviceService.proto b/incubator/rpc-grpc/src/main/proto/DeviceService.proto
index 7ac8489..5ae7cd6 100644
--- a/incubator/rpc-grpc/src/main/proto/DeviceService.proto
+++ b/incubator/rpc-grpc/src/main/proto/DeviceService.proto
@@ -1,8 +1,8 @@
 syntax = "proto3";
 option java_package = "org.onosproject.grpc.net.device";
 
-import "Device.proto";
-import "Port.proto";
+import "models/Device.proto";
+import "models/Port.proto";
 
 package Device;