mail_daemon: auto check message was leaked, send immediately.

* BMessageRunner does not take ownership of the message.
* Instead of waiting through the complete interval, we send an auto check
  message immediately after launch (or whenever else the timer is being
  started).
* Added constant instead of referring to 'moto' for the auto check message.
imap_tester: Fixed SSL build.
IMAP: The connection workers are now started.

* On SyncMessages(), the main connection worker is started if it is not already
  running (it may only run already in idle mode).
* This will then list the subscribed folders, and create as many more connection
  workers as allowed and make sense.
* Finally, it will distribute the folders to the workers which don't do anything
  further yet.