Monitor server certificate/key and restart gnmi server when rotated

Makefile

@@ -124,6 +124,7 @@ ifneq ($(ENABLE_DIALOUT_VALUE),0)
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(TESTENV) $(GO) test -coverprofile=coverage-dialcout.txt -covermode=atomic -mod=vendor $(BLD_FLAGS) -v github.com/sonic-net/sonic-gnmi/dialout/dialout_client
 endif
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(GO) test -race -coverprofile=coverage-data.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/sonic_data_client
+	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(GO) test -race -coverprofile=coverage-data.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/telemetry
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(GO) test -race -coverprofile=coverage-dbus.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/sonic_service_client
 	sudo CGO_LDFLAGS="$(CGO_LDFLAGS)" CGO_CXXFLAGS="$(CGO_CXXFLAGS)" $(TESTENV) $(GO) test -race -coverprofile=coverage-translutils.txt -covermode=atomic -mod=vendor -v github.com/sonic-net/sonic-gnmi/transl_utils
 	$(GO) get github.com/axw/gocov/...

gnmi_server/server.go

@@ -177,6 +177,15 @@ func (srv *Server) Serve() error {
 	return srv.s.Serve(srv.lis)
 }
 
+func (srv *Server) Stop() {
+	s := srv.s
+	if s == nil {
+		log.Errorf("Stop() failed: not initialized")
+		return
+	}
+	srv.s.Stop()
+}
+
 // Address returns the port the Server is listening to.
 func (srv *Server) Address() string {
 	addr := srv.lis.Addr().String()