Log Message:
Update to Dovecot 1.1.11.

- IMAP: PERMANENTFLAGS list didn't contain \*, causing some clients
  not to save keywords.
- dbox: INTERNALDATE and save date was returned wrong for converted
  maildir files.
- auth: Using "username" or "domain" passdb fields caused \ 
problems
  with cache and blocking passdbs in v1.1.8 .. v1.1.10.
- userdb prefetch + blocking passdbs was broken with non-plaintext
  auth in v1.1.8 .. v1.1.10.
- If mail_chroot is set, don't fail at startup in dump-capability.