[openpgp] Bugfixes

- Parse datetime correctly and convert to int
- Query contact keys on openpgp activation

openpgp/modules/pgp_keylist.py

@@ -98,6 +98,7 @@ class PGPKeylist(AbstractPEPModule):
                     raise StanzaMalformed('Invalid date timestamp: %s', date)
 
             keylist.append(Key(attrs['v4-fingerprint'], int(timestamp)))
+
         return keylist
 
     def _notification_received(self, jid, keylist):