Add iputils-ping to the build scripts

iputils-ping is a required tool for yocto-2.3.

Change-Id: I51834fbc542f88c5f1e673428edb9a56a4f58862
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/qemu-build.sh b/qemu-build.sh
index c62cefb..33a2a00 100755
--- a/qemu-build.sh
+++ b/qemu-build.sh
@@ -128,7 +128,8 @@
     libpixman-1-dev \
     make \
     python-yaml \
-    python3-yaml
+    python3-yaml \
+    iputils-ping
 
 RUN grep -q ${GROUPS} /etc/group || groupadd -g ${GROUPS} ${USER}
 RUN grep -q ${UID} /etc/passwd || useradd -d ${HOME} -m -u ${UID} -g ${GROUPS} ${USER}