CVE-2020-24386: Specially crafted command can cause IMAP hibernate to
allow logged in user to access other people's emails and filesystem
information.
Metric filter and global event filter variable syntax changed to a
SQL-like format.
auth: Added new aliases for %{variables}. Usage of the old ones is
possible, but discouraged.
auth: Removed RPA auth mechanism, SKEY auth mechanism, NTLM auth
mechanism and related password schemes.
auth: Removed passdb-sia, passdb-vpopmail and userdb-vpopmail.
auth: Removed postfix postmap socket
