[SAC] OSGeo Id creation disabled

[Alex M]

For those not on IRC. We've temporarily disabled OSGeo Id creation.
Accounts were being autogenerated and then used to spam the Trac
instances. Other systems using OSGeo auth should check for any unusual
activity.

As a follow-up, we are now looking for someone who wants to improve our
creation system with Captcha, and/or email confirmation. If you think
you can build (or modify the existing) such a system to work with our
LDAP please contact the osgeo System Administration Committee (SAC).

Thanks,
Alex