Merge branch 'wantedby_docker' into 'master'

docker: start containers together with docker.service

See merge request !21

roles/docker/templates/systemd.j2

@@ -2,6 +2,7 @@
 Description={{ service.name }}/{{ container.name }}
 After=docker.service
 Requires=docker.service
+WantedBy=docker.service
 
 [Service]
 EnvironmentFile=-/etc/default/{{ service.name }}-{{ container.name }}