Moving all references to proto v4

Change-Id: Idbb9119da7ddae136f7ffbbb783429c7e049b3ab
diff --git a/go/ietf/ietf_interfaces.pb.go b/go/ietf/ietf_interfaces.pb.go
index b69638f..81470db 100644
--- a/go/ietf/ietf_interfaces.pb.go
+++ b/go/ietf/ietf_interfaces.pb.go
@@ -391,42 +391,42 @@
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