Install correct version of arping

Currently Ubuntu source installation loads arping package which is version
2.11. It does not support -U keyword which is used by lbaas.
iputil-arping package should be used instead.

Change-Id: I64c5e5b40e561d309281204b4f6aeaf0fb395cb5
Closes-Bug: #1586085

docker/neutron/neutron-base/Dockerfile.j2

@@ -36,7 +36,7 @@ RUN yum -y install \
     {% elif base_distro in ['ubuntu', 'debian'] %}
 
 RUN apt-get -y install --no-install-recommends \
-        arping \
+        iputils-arping \
         conntrack \
         dnsmasq \
         dnsmasq-utils \