Quite often, syncing seems to get stuck. This is not reproduceable 100%, but in general syncing gets stuck most of the time.

To reproduce:
1. Create a new IMAP resource with the following settings
	- Server: demo.kolab.org
	- Account: kdabtest3@demo.kolab.org
	- Disconnected mode enabled
	- Security settings auto-detected
2. Initial sync is done automatically, folder listing appears in the browser
   tab of Akonadiconsole
3. click on the "shared.common.playground" folder to read some mails there
	- Note that the messages seem to be received when clicking on the 
	  folder. Since this is disconnected mode, I expected that
	  all messages were already downloaded during the initial sync. But 
	  this is another bug, unrelated to this one.
4. the agents tab in Akonadiconsole shows that the IMAP resource got stuck   
   syncing the shared.common.playground collection. The percentage where it 
   gets stuck is always different, this time at 48%. No network activity is 
   happening, so it is not waiting to download something.