migrated secop_psi drivers to new syntax

- includes all changes up to 'fix inheritance order' from git_mlz
  6a32ecf342

Change-Id: Ie3ceee3dbd0a9284b47b1d5b5dbe262eebe8f283

test/test_msg.py

@@ -23,8 +23,8 @@
 
 import pytest
 
-from secop.protocol.interface import encode_msg_frame, decode_msg
 import secop.protocol.messages as m
+from secop.protocol.interface import decode_msg, encode_msg_frame
 
 # args are: msg tuple, msg bytes
 MSG = [