fabfile: many deployment updates

* Generates symlinks to AFS for production.

* New deployment of Invenio sources alongside Inspire sources.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
fabfile: graceful apache reload with haproxy

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