This aligns the search filter escaping to [RFC4515](https://tools.ietf.org/search/rfc4515).
`base.ldif` has also been updated to be a closer match to RFC 2307.
* [BUGFIX] Set username retrieved from authentication backend in session.
In some setups, binding is case insensitive but Authelia is case
sensitive and therefore need the actual username as stored in the
authentication backend in order for Authelia to work correctly.
Fixes#561.
* Use uid attribute as unique user identifier in suites.
* Fix the integration tests.
* Update config.template.yml
* Compute user filter based on username attribute and users_filter.
The filter provided in users_filter is now combined with a filter
based on the username attribute to perform the LDAP search query
finding a user object from the username.
* Fix LDAP based integration tests.
* Update `users_filter` reference examples
* [BUGFIX] Fix crash when no emails or groups are retrieved from LDAP.
If group or email attribute configured by user in configuration is not
found in user object the list of attributes in LDAP search result is empty.
This change introduces a check before accessing the first element of the
list which previously led to out of bound access.
Fixes#647.
* [MISC] Change log level of LDAP connection creation to trace.
- Make the DN concatenation uniform between both Users and Groups
- Make it possible to use a blank or commented out additional_users_dn or additional_groups_dn for ldap backends
- Fixes#508
