Release 1.2.8

Release 1.2.8

* Another fix for exim workaround (#637)
* Fix unencrypted passwords processing in the controller
* Fix setting path for lua (#652)
* Fix usage of rdns reply structure (#654)
* Use file lock in logger to avoid deadlocks
* Add `application/octet-stream` mime type for `pdf` extension (by @moisseev)
* Implement new automata to skip empty lines for dkim signing (#651)
* Fix parsing of missing classes
* Clarify some rspamc arguments (by @fatalbanana)
* Correct suppress spelling

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>