New keymanager API

   get_all_keys_in_local_db -> get_all_keys
   parse_openpgp_ascii_key -> None

Update for changes in: leapcode/keymanager#52
As I comment in the keymanager issue I need to think a bit more if we can remove this method. This piece of code is not used, there is a 'return' on top of it. That is why I added this comment, for the future if you want to make this code available again.