I don't know whether someone finds it useful, but how I imported contacts from my N9, was just to create a folder Contacts in /home/nemo/ and a) exported N9 to file, b) copied the vcards from /home/user/MyDocs/Contacts where N9 saved them over to the /home/nemo/Contacts, rebooted and every contact was updated automatically. I then factory reset the phone updated again to newest OTA, tried it again and it just works - easiest method so far AFAIK. (NOTE: this was before adding any sync-able account)