Add Dockerfile template for haproxy

Change-Id: If269a483a1f2a9fd1258fdcb90b139d137037dfd
Partially-Implements: blueprint dockerfile-template

docker_templates/haproxy/Dockerfile.j2

+FROM {{ namespace }}/{{ base_distro }}-{{ install_type }}-base:{{ tag }}
+MAINTAINER Kolla Project (https://launchpad.net/kolla)
+
+{% if base_distro in ['fedora', 'centos', 'oraclelinux'] %}
+
+RUN yum -y install \
+        haproxy \
+    && yum clean all
+
+{% elif base_distro in ['ubuntu', 'debian'] %}
+
+RUN echo '{{ install_type }} not yet available for {{ base_distro }}' \
+    && /bin/false
+
+{% endif %}
+
+COPY start.sh /
+COPY config-external.sh ensure_latest_config.sh /opt/kolla/
+
+CMD ["/start.sh"]

docker_templates/haproxy/config-external.sh

+../../docker/common/haproxy/config-external.sh
\ No newline at end of file

docker_templates/haproxy/ensure_latest_config.sh

+../../docker/common/haproxy/ensure_latest_config.sh
\ No newline at end of file

docker_templates/haproxy/start.sh

+../../docker/common/haproxy/start.sh
\ No newline at end of file