gpg: fix bytes/str issue with GPG user ID

trezor_agent/device/interface.py

@@ -41,6 +41,7 @@ def identity_to_string(identity_dict):
         result.append(':' + identity_dict['port'])
     if identity_dict.get('path'):
         result.append(identity_dict['path'])
+    log.debug('identity parts: %s', result)
     return ''.join(result)
 
 

trezor_agent/gpg/agent.py

@@ -47,7 +47,7 @@ def open_connection(keygrip_bytes):
         pubkey_bytes=keyring.export_public_keys(),
         keygrip=keygrip_bytes)
     # We assume the first user ID is used to generate TREZOR-based GPG keys.
-    user_id = user_ids[0]['value']
+    user_id = user_ids[0]['value'].decode('ascii')
     curve_name = protocol.get_curve_name_by_oid(pubkey_dict['curve_oid'])
     ecdh = (pubkey_dict['algo'] == protocol.ECDH_ALGO_ID)