Add LDAP_OPT_X_SASL_CBINDING option to define the binding type to use,
defaults to "none".

Add "tls-endpoint" binding type implementing "tls-server-end-point" from
RCF 5929, which is compatible with Windows.

Fix "tls-unique" to include the prefix in the bindings as per RFC 5056.

Ondřej Kuzník authored Sep 22, 2015 and Quanah Gibson-Mount committed Apr 06, 2020

Still needs to retrieve the entry for ACL resolution until we can
restrict controls with ACLs.

Note that with slapd-ldap, the special character "*" actually allows anonymous rather than denies, as is the case with authz-policy

1) allow filtering on dynamic attribute values
2) populate an optionally configured memberOf attribute

test044 script still needs to be extended to test these
enhancements. We need to define an interim attributeType
for testing memberOf functionality.

Remove some remaining documentation bits referencing bdb/hdb databases
Remove regression test specific to back-bdb

This commits deletes all references and code for back-bdb and back-hdb.
There is some follow up work still necessary to flush out the admin
guide for back-mdb.

Update to note that MDB is the primary backend and HDB/BDB are
deprecated.

Commit 279594c2 officially marked
slapd-mdb as being the recommended backend for OpenLDAP, superseding
back-hdb.  This man page was missed during that update.