roles/docker: Install and set up Docker daemon

The *docker* role configures the Docker daemon on the managed machine.

roles/docker/templates/docker-storage-setup.j2

@@ -0,0 +1,14 @@
+# Edit this file to override any configuration options specified in
+# /usr/lib/{{ docker_storage_setup }}/{{ docker_storage_setup }}.
+#
+# For more details refer to "man {{ docker_storage_setup }}"
+
+{% if docker_storage_devs is defined %}
+DEVS="{{ docker_storage_devs|join(' ') }}"
+{% endif %}
+{% if docker_storage_vg is defined %}
+VG={{ docker_storage_vg }}
+{% endif %}
+{% if docker_storage_data_size is defined %}
+DATA_SIZE={{ docker_storage_data_size }}
+{% endif %}