Automx2 and ldap configuration

[Ralph Seichter]

* Stephane Branchoux:

> I don’t understand how and where to configure ldap parameters in order
> to change %EMAILLOCALPART% by my LDAP uid.

https://gitlab.com/automx/automx2/-/blob/master/contrib/sqlite-sample.sql
lines 27 ff show the "ldapserver" table's definition and sample content.
The values of "attr_uid" and "attr_cn" define the LDAP attribute names
for user ID and common name, respectively.

Remember to also set the ldapserver_id field for the domains you want to
bind to a specific LDAP server.

-Ralph