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

Change-Id: Id52a3cf7b1a69f20e8b061d0655015857fa19ae5
diff --git a/go.sum b/go.sum
index bb852d3..13bf2f6 100644
--- a/go.sum
+++ b/go.sum
@@ -146,8 +146,8 @@
 github.com/opencord/voltha-lib-go/v4 v4.1.0/go.mod h1:K7lDkSkJ97EyfvX8fQtBmBvpj7n6MmwnAtD8Jz79HcQ=
 github.com/opencord/voltha-protos/v4 v4.0.12 h1:x8drb8inaUByjVLFbXSiQwRTU//dfde0MKIHyKb1JMw=
 github.com/opencord/voltha-protos/v4 v4.0.12/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
-github.com/opencord/voltha-protos/v4 v4.0.14 h1:5Zofvc3E+us/3N0HYEqGdVc2yuEoyaFDs8Rd/C4+ELE=
-github.com/opencord/voltha-protos/v4 v4.0.14/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
+github.com/opencord/voltha-protos/v4 v4.0.15 h1:TOKYlt/75w5pxT44HeYfo2kqKvqmHzVpUkiCHOMJTN8=
+github.com/opencord/voltha-protos/v4 v4.0.15/go.mod h1:W/OIFIyvFh/C0vchRUuarIsMylEhzCRM9pNxLvkPtKc=
 github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsqf19k25Ur8rU=
 github.com/opentracing/opentracing-go v1.1.0/go.mod h1:UkNAQd3GIcIGf0SeVgPpRdFStlNbqXla1AfSYxPUl2o=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=