Use authentication variables populated by Apache

[john.barstow@…]

Documentation here:

http://httpd.apache.org/docs/2.2/mod/mod_authnz_ldap.html#exposed

If the display name and email are part of the LDAP query, the AUTHENTICATE_DISPLAYNAME and AUTHENTICATE_MAIL environment variables will be set.

Presumably other Apache auth modules may also set these variables. The attached patch will check for the existence of the variables and set the corresponding profile data.

[john.barstow@…]

Uses authentication variables if present

[nkantrowitz]

Wait for the modular session data system, then put this in with the other LDAP plugin stuff. If you can show this is some kind of standard with Apache modules I would think higher of putting it in core, but it seems pretty Apache+mod_authnz_ldap specific.

[rblank]

This is related to #791. Scheduling to the same milestone.