[MM-16751] golint model (#17896)

app/admin.go

@@ -155,8 +155,8 @@ func (s *Server) InvalidateAllCaches() *model.AppError {
 	if s.Cluster != nil {
 
 		msg := &model.ClusterMessage{
-			Event:            model.CLUSTER_EVENT_INVALIDATE_ALL_CACHES,
-			SendType:         model.CLUSTER_SEND_RELIABLE,
+			Event:            model.ClusterEventInvalidateAllCaches,
+			SendType:         model.ClusterSendReliable,
 			WaitForAllToSend: true,
 		}
 
@@ -211,7 +211,7 @@ func (a *App) TestEmail(userID string, cfg *model.Config) *model.AppError {
 
 	// if the user hasn't changed their email settings, fill in the actual SMTP password so that
 	// the user can verify an existing SMTP connection
-	if *cfg.EmailSettings.SMTPPassword == model.FAKE_SETTING {
+	if *cfg.EmailSettings.SMTPPassword == model.FakeSetting {
 		if *cfg.EmailSettings.SMTPServer == *a.Config().EmailSettings.SMTPServer &&
 			*cfg.EmailSettings.SMTPPort == *a.Config().EmailSettings.SMTPPort &&
 			*cfg.EmailSettings.SMTPUsername == *a.Config().EmailSettings.SMTPUsername {