Added a glance role

This role builds and installs a docker image from

ssh://git@git.webhosting.rug.nl:222/P<t_CO>174/docker-glance.git

roles/glance/templates/glance.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Openstack Glance Container
+After=docker.service
+Requires=docker.service
+
+[Service]
+TimeoutStartSec=0
+Restart=always
+ExecStartPre=-/usr/bin/docker stop %n
+ExecStartPre=-/usr/bin/docker rm %n
+ExecStart=/usr/bin/docker run --name %n \
+  --add-host=mariadb:{{ hostvars[groups['databases'][0]]['ansible_default_ipv4']['address'] }} \
+  -p 9292:9292 \
+  hpc/openstack-glance
+
+[Install]
+WantedBy=multi-user.target