Customizations for Multipathd

This patchset contains customization of Dockerfile of the Multipathd
container.

Change-Id: Ibf68b538eaa3cdd0fd6f190f234db845459192ec
Partially-implements: blueprint third-party-plugin-support

docker/multipathd/Dockerfile.j2

 FROM {{ namespace }}/{{ image_prefix }}base:{{ tag }}
 MAINTAINER {{ maintainer }}
 
-{% if base_distro in ['centos', 'fedora', 'oraclelinux', 'rhel'] %}
-
-RUN yum -y install \
-        device-mapper-multipath \
-    && yum clean all
+{% import "macros.j2" as macros with context %}
 
+{% if base_distro in ['centos', 'fedora', 'oraclelinux', 'rhel'] %}
+    {% set multipathd_packages = ['device-mapper-multipath'] %}
 {% elif base_distro in ['ubuntu', 'debian'] %}
-
-RUN apt-get -y install --no-install-recommends \
-        multipath-tools \
-    && apt-get clean
-
+    {% set multipathd_packages = ['multipath-tools'] %}
 {% endif %}
 
+RUN {{ macros.install_packages(multipathd_packages | customizable("packages")) }}
+
+{% block multipathd_footer %}{% endblock %}
+{% block footer %}{% endblock %}
 {{ include_footer }}