Allows neutron-agents l3 agent to communicate with OVS

The neutron-agents l3 agent requires access to the OVS database via
access to /run.  It also needs to have ovs-vsctl binary available in
the container.

Change-Id: I903537b570cd60c9bb1088e9408a5f6ea4988d8f
Closes-Bug: #1477376

ansible/roles/neutron/tasks/start.yml

@@ -44,6 +44,7 @@
     container_name: "neutron_agents"
     container_privileged: "True"
     container_volumes:
+      - "/run:/run"
       - "{{ node_config_directory }}/neutron-agents/:/opt/kolla/neutron-agents/:ro"
   when: inventory_hostname in groups['neutron-agents']
 

docker/centos/binary/neutron/neutron-base/Dockerfile

@@ -4,6 +4,7 @@ MAINTAINER Kolla Project (https://launchpad.net/kolla)
 RUN yum -y install openstack-neutron \
                    openstack-neutron-ml2 \
                    python-neutron-client \
+                   openvswitch \
                    && yum clean all
 
 COPY config-neutron.sh config-sudoers.sh /opt/kolla/