Improved test to be skipped when executed within a container.
diff --git a/utils/docker/Dockerfile b/utils/docker/Dockerfile
index d71a53d..2c1bda6 100644
--- a/utils/docker/Dockerfile
+++ b/utils/docker/Dockerfile
@@ -1,5 +1,7 @@
 FROM cgeoffroy/dockernet
 
+ENV SON_EMU_IN_DOCKER 1
+
 # ensure that we have the latest dockernet code base!
 WORKDIR /
 RUN rm -rf dockernet