jupyterhup: WIP role

Not using it at the moment, but I could resume working on it at some point,
whon knows ?

jupyterhub/README.md

+WIP JupyterHUB role
+===================
+
+**Work in progress, cannot be used as-is.**

jupyterhub/tasks/main.yml

+- name: install apt dependencies
+  apt: pkg={{ item }}
+  with_items:
+    - npm
+    - nodejs-legacy
+
+- name: create dedicated user
+  user: name=jupyterhub home=/opt/jupyterhub
+
+- name: install jupyterhub
+  pip: name=jupyterhub virtualenv=/opt/jupyterhub/venv
+  become: jupyterhub
+  notify: restart jupyterhub
+
+- name: systemd script is in place
+  template:
+    src: jupyterhub.service.j2
+    dest: /etc/systemd/system/jupyterhub.service
+  notify: restart jupyterhub

jupyterhub/templates/jupyterhub.service.j2

+[Unit]
+Description=JupyterHub
+After=network.target
+
+[Service]
+WorkingDirectory=/opt/jupyterhub/
+ExecStart=/opt/jupyter/venv/bin/jupyterhub
+
+[Install]
+WantedBy=multi-user.target