- Add delay between LDAP calls (default to 500ms)
- Callback on LDAP when there are more results available than requested. - Option to set a minimum character count to start a LDAP search. - Fix doc - Make persistent the LDAP server configurations. - Add/Update/Remove LDAP server from core. - Rewrite LDAP tests with callbacks and stats.
Cherry-pick: !2637 (merged) Cherry-pick: !2644 (merged)