workflows: subject as unicode

* Handles unicode characters in the submission title for the
  ticket subject.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
fabfile: fix Inspire overlay installation

* Stops Celery and unsubscribes the node upon installation.

* Installs using python setup.py install instead of pip to avoid
  issue with Invenio dependency.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>