Better behavior on cleanup

With the previous code in domains with many users and enumeration enable we
would eventually end up making thousands of individual searches for entries in
the clean-up process.

Change the code to do a full enumeration before a cleanup so we do one single
big search to update all entries and only then search for entries to purge.

This also fixes the fact that the cleanup task was running at every enumeration
instead of running every "ldap_purge_cache_timeout" seconds.

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