Log Message:
Update cyrus-imapd to 2.2.13.
Patch provided by Jukka Salmi via PR 33576.

Changes to the Cyrus IMAP Server since 2.2.12

 * Allow sieve scripts to be run on shared mailboxes (via sieve annotation).
 * Updated nntpd to be compliant with latest draft (soon to be RFC3977).
 * Updated IMAP UIDPLUS extension to be compliant with latest specification
    (RFC4315).
 * Performance improvements to quota utility.
 * Fixed possible race condition in IMAP IDLE.
 * Made ptloader runtime configurable.
 * Added more extensive output to arbitron.
 * Allow responses of any length from backend when proxing IMAP/POP3/NNTP
   traffic.
 * Added plaintextloginalert option.
 * Only allow mbpath to be run as Cyrus user.
 * Added berkeley_hash and berkeley_hash_nosync cyrusdb backends (seem to
   perform better under heavy loads).
 * Added lastpop mailbox annotation.
 * Added subscribe/unsubscribe support to cyradm.
 * Fixed miscellaneous bugs and build issues.