centos-rdo-neutron-base fails to build

An ordering problem with the Dockerfile resultled in this
container and all thin containers failing to build.  This patch
Fixes that problem.

Change-Id: I4a7ba1554bdcba3f2147eb4eaa628d1cc19f84fd
Co-Authored-By: Jeff Peeler <jpeeler@redhat.com>
Closes-Bug: #1468486

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

@@ -6,10 +6,11 @@ RUN yum -y install openstack-neutron \
                    python-neutron-client \
     && yum clean all
 
+RUN mkdir -p /opt/kolla/host_proc
+
 RUN pip install nsenter \
     && ln -s 1 /opt/kolla/host_proc/self
 
-RUN mkdir -p /opt/kolla/host_proc
 COPY config-neutron.sh config-sudoers.sh /opt/kolla/
 
 RUN mv /sbin/ip /opt/kolla/ip