Ticket #47874 - Performance degradation with scope ONE after some load
Bug Description: Backend has a bit to indicate "should not bypass
the filter test". It's set if one of the search results is ALLID
in idl_intersection. Once the flag is set, it's never been unset.
It makes the following one level searches slow down.
Fix Description: Introduced slapi_be_unset_flag and unset the bit
at the end of every search.
https://fedorahosted.org/389/ticket/47874
Reviewed by rmeggins@redhat.com (Thank you, Rich!!)
(cherry picked from commit 8e1345ab9276d1cf9c9ac2cbd858c398235ef5ce)