add support for fingerprints and/or long keyids in duplicity handler
The gpg configuration on duplicity only support short (8 characters) keyids. It's proben that it's possible to create keys for a choosen keyid (https://github.com/micahflee/trollwot_gnupg). Will be nice to be able to set the fingerprint or at least the long keyids.
AFAIK duplcity support fingerprints and long keyids, the limitation here seems to be in backupninja side.
(from redmine: created on 2015-05-10, closed on 2015-05-10)