Add ping utility

Change-Id: I9587c1088bfbba20bf3e2dea89422793d19c491c
diff --git a/Dockerfile b/Dockerfile
index 6b9b96d..f7c4562 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,6 +4,8 @@
 
 USER root
 
+RUN apt-get update; apt-get install -y inetutils-ping
+
 WORKDIR /var/lib/
 
 RUN mkdir -p cvp-configuration