Revert dovecot (imapc) to stable (2.1.7-7+deb7u1).

There seem to be multiple bugs with the version from wheezy-backports
(2.2.9-1~bpo70+1), and the client is killed on THREAD commands:

  guilhem@elefant:~$ telnet localhost 143
  Trying ::1...
  Trying 127.0.0.1...
  Connected to localhost.
  Escape character is '^]'.
  * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN] Dovecot ready.
  a LOGIN guilhem xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  a OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT SORT=DISPLAY THREAD=REFERENCES THREAD=REFS THREAD=ORDEREDSUBJECT MULTIAPPEND URL-PARTIAL CATENATE UNSELECT CHILDREN NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS SPECIAL-USE BINARY MOVE NOTIFY] Logged in
  b SELECT INBOX
  * FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
  * OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft \*)] Flags permitted.
  * 8060 EXISTS
  * 0 RECENT
  * OK [UIDVALIDITY 1302032711] UIDs valid
  * OK [UIDNEXT 78905] Predicted next UID
  * OK [NOMODSEQ] No permanent modsequences
  b OK [READ-WRITE] Select completed (0.395 secs).
  c THREAD REFERENCES UTF-8 ALL
  Connection closed by foreign host.

  :/var/log/syslog
  Jun 27 21:58:01 elefant dovecot: imap(guilhem@fripost.org): Fatal: master: service(imap): child 24907 killed with signal 11 (core dumps disabled)
  Jun 27 21:58:01 elefant kernel: [248570.057270] imap[24907]: segfault at 400 ip 00007f7651596e09 sp 00007fff6e267760 error 4 in libdovecot.so.0.0.0[7f765153a000+cc000]

Other (less scary) errors can be found in the syslog:

  Jun 27 20:26:09 elefant dovecot: imap(xxxx@fripost.org): Error: file_dotlock_open() failed with file /home/imapproxy/fripost.org/xxxx/imapc/dovecot.list.index.log: No such file or directory
  Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Error: imapc(imap.fripost.org:993): Command '11 APPEND "Sent" (\Seen) {2512485}' timed out, disconnecting
  Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Error: imapc: COPY failed: Disconnected from server
  Jun 27 21:30:10 elefant dovecot: imap(xxxx@fripost.org): Disconnected: IMAP session state is inconsistent, please relogin. in=2512632 out=969

This is infortunate as we cannot benefit from the 'fetch-headers'
imapc_features right now.  However, the bugs (at least the segfault) seems to
be fixed as of 2.2.13-1, the version which can currently be found in testing.
Hopefully it'll be backported soon :-)

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