Ticket 49495 - Fix memory management is vattr.
Bug Description: During the fix for
https://pagure.io/389-ds-base/issue/49436 a issue was exposed
in how registration of attributes to cos work. With the change
to handle -> attr link, this exposed that cos treats each attribute
and template pair as a new type for the handle. As aresult, this
caused the sp_list to create a long linked list of M*N entries
for each attr - template value. Obviously, this is extremely
slow to traverse during a search!
Fix Description: Undo part of the SLL next change and convert
to reference counting. The issue remains that there is a defect
in how cos handles attribute registration, but this can not be
resolved without a significant rearchitecture of the code
related to virtual attributes.
Review by: tbordaz, lkrispen (Thanks!)