dovecot updated to 2.2.6, pigeonhole updated to 0.4.2
    
    - director: v2.2.5 changes caused "SYNC lost" errors
    - dsync: Many fixes and error handling improvements
    - doveadm -A: Don't waste CPU by doing a separate config lookup
      for each user
    - Long-running ssl-params process no longer prevents Dovecot restart
    - mbox: Fixed mailbox_list_index=yes to work correctly