[VOL-4371] Voltha protos cleanup

Change-Id: I5ea4319fd643551c68bd80521c84b69206bbedfd
diff --git a/.golangci.yml b/.golangci.yml
index 978402e..9477f94 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -29,3 +29,4 @@
   exclude:
     - "Package github.com/golang/protobuf/proto is deprecated"
     - "Package github.com/golang/protobuf/jsonpb is deprecated"
+    - "SA1019: voltha.ImageDownload is deprecated"