v2.2.22 released

[Timo Sirainen]

http://dovecot.org/releases/2.2/dovecot-2.2.22.tar.gz
http://dovecot.org/releases/2.2/dovecot-2.2.22.tar.gz.sig

 + Added doveadm HTTP API: See
   http://wiki2.dovecot.org/Design/DoveadmProtocol/HTTP
 + virtual plugin: Mailbox filtering can now be done based on the
   mailbox metadata. See http://wiki2.dovecot.org/Plugins/Virtual
 + stats: Added doveadm stats reset to reset global stats.
 + stats: Added authentication statistics if auth_stats=yes.
 + dsync, imapc, pop3c & pop3-migration: Many optimizations,
   improvements and error handling fixes.
 + doveadm: Most commands now stop soon after SIGINT/SIGTERM.
 - auth: Auth caching was done too aggressively when %variables were
   used in default_fields, override_fields or LDAP pass/user_attrs.
   userdb result_* were also ignored when user was found from cache.
 - imap: Fixed various assert-crashes caused v2.2.20+. Some of them
   caught actual hangs or otherwise unwanted behavior towards IMAP
   clients.
 - Expunges were forgotten in some situations, for example when
   pipelining multiple IMAP MOVE commands.
 - quota: Per-namespaces quota were broken for dict and count backends
   in v2.2.20+
 - fts-solr: Search queries were using OR instead of AND as the
   separator for multi-token search queries in v2.2.20+.
 - Single instance storage support wasn't really working in v2.2.16+
 - dbox: POP3 message ordering wasn't working correctly.
 - virtual plugin: Fixed crashes related to backend mailbox deletions.