[VOL-3548] Differentiate between OLT gRPC channel
disconnect and device reboot

Change-Id: Id52a3cf7b1a69f20e8b061d0655015857fa19ae5
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 7e4c2b9..50d4a85 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -69,7 +69,7 @@
 github.com/opencord/voltha-lib-go/v4/pkg/probe
 github.com/opencord/voltha-lib-go/v4/pkg/techprofile
 github.com/opencord/voltha-lib-go/v4/pkg/version
-# github.com/opencord/voltha-protos/v4 v4.0.14
+# github.com/opencord/voltha-protos/v4 v4.0.15
 github.com/opencord/voltha-protos/v4/go/common
 github.com/opencord/voltha-protos/v4/go/ext/config
 github.com/opencord/voltha-protos/v4/go/extension