This will be usable to implement some maps/acl caches for heavy datasets
loaded from files (mostly regex-based but in general anything that cannot
be indexed in a tree).
The ultree code has been removed in favor of a simpler and
cleaner ebtree implementation. The eternity queue does not
need to exist anymore, and the pool_tree64 has been removed.
The ebtree node is stored in the task itself. The qlist list
header is still used by the run-queue, but will be able to
disappear once the run-queue uses ebtree too.
Willy Tarreau