[SAC] GitLab deploy update

[Sandro Santilli]

For the record: I've opened up LDAP to Vincent's host, ordered
for 6 months. Expiration date is written in the init.d file so
we remember to close it on expiration.

Björn set up GitLab with LDAP authentication via https here:
https://vps306914.ovh.net/
The SSL certificate is self-signed.

Still todo:

 - Obtain a trusted SSL certificate (easy with letsencrypt/certbot)
 - Configure GitLab to be accessible via a /gitlab subdir
 - Setup Apache reverse proxy on git.osgeo.org so the service
   appears as https://git.osgeo.org/gitlab
 - Disable registration, point "sign up" links to the OSGeo Userid
   registration form
 - Add OSGeo Branding

Björn, do you need help with any of the above ?

--strk;