- 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: !1884 (merged) Cherry-pick: !1876 (merged)