Customizations for Kuryr

This patchset contains customization of Dockerfile of the Kuryr
container.

Change-Id: I254befb427530949284f645c9d61c54331aba53a
Partially-implements: blueprint third-party-plugin-support

docker/kuryr/Dockerfile.j2

@@ -16,4 +16,6 @@ RUN ln -s kuryr-source/* kuryr \
 
 COPY extend_start.sh /usr/local/bin/kolla_extend_start
 
+{% block kuryr_footer %}{% endblock %}
+{% block footer %}{% endblock %}
 {{ include_footer }}