VOL-3248 Support for SetExtValue API

         This commits adds a new SetExtValue API in the VOLTHA
         core and also the handling of the request.

Change-Id: I45b76e4bcc3234842c8404514f5220573ac33211
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 0e5ebad..693b6fb 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -117,8 +117,9 @@
 github.com/opencord/voltha-lib-go/v3/pkg/mocks/kafka
 github.com/opencord/voltha-lib-go/v3/pkg/probe
 github.com/opencord/voltha-lib-go/v3/pkg/version
-# github.com/opencord/voltha-protos/v3 v3.4.1
+# github.com/opencord/voltha-protos/v3 v3.4.2
 github.com/opencord/voltha-protos/v3/go/common
+github.com/opencord/voltha-protos/v3/go/ext/config
 github.com/opencord/voltha-protos/v3/go/inter_container
 github.com/opencord/voltha-protos/v3/go/omci
 github.com/opencord/voltha-protos/v3/go/openflow_13