[Dovecot] v2.2.rc6 released

http://dovecot.org/releases/2.2/rc/dovecot-2.2.rc6.tar.gz http://dovecot.org/releases/2.2/rc/dovecot-2.2.rc6.tar.gz.sig

Some more fixes to bugs I noticed today while trying out some new things in production. Note especially the replicator-doveadm socket change, see http://wiki2.dovecot.org/Replication for how to configure it. This change allowed local replicator to notify the remote replicator about user being synced.

* replicator: Don't create replicator-doveadm socket by default.
  This way doveadm replicator commands don't accidentally start an
  unconfigured replicator server.
+ replicator: Have remote dsync notify the remote replicator that
  a user was just synced. This way the replicators are kept roughly
  in sync.
+ Added ssl_client_ca_file to specify the CA certs as a file. This is
  needed (instead of ssl_client_ca_dir) in RedHat-based systems.
+ Added "doveadm fs" commands, mainly to debug lib-fs backends.
- Mailbox list indexes weren't using proper file permissions based
  on the root directory.