(ITS#6664) Server control forwarding in back_meta and back_ldap

[jsceballos@gmail.com]

Full_Name: Javier Sanz
Version: 2.4.17
OS: Debian Linux 5.0
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (80.38.203.12)


back_meta and back_ldap should forward server controls that clients use in their
queries to the corresponding external LDAP servers.

For example, the inhability to send controls to external servers currently
causes that RFC2696 paged results control cannot be used, so it is impossible to
retrieve more results for a query than the page size configured in the external
server, which often is not a big number.