Ticket 48363 - Support for rfc3673 '+' to return operational attributes
Bug Description: We should support rfc3673 to return operational attributes
in searches.
Fix Description: We implement the '+' operator as per [0].
Additionally, we need to add "supportedFeatures" as per [1]. As a result, we
have implemented both rfcs now.
This can be shown by adding '+' to any search.
We also add a test case that proves '+' works, that '*' works, and specific
named attributes work also. Acis are also correctly respected by this change,
even for operational attributes.
[0] https://tools.ietf.org/html/rfc3673
[1] https://tools.ietf.org/html/rfc3674
https://fedorahosted.org/389/ticket/48363
Author: wibrown
Review by: nhosoi (Thanks! )