migrated secop_psi drivers to new syntax

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

Change-Id: Ie3ceee3dbd0a9284b47b1d5b5dbe262eebe8f283

secop/lib/sequence.py

@@ -141,7 +141,7 @@ class SequencerMixin:
             return self.read_hw_status()
         return self.Status.IDLE, ''
 
-    def do_stop(self):
+    def stop(self):
         if self.seq_is_alive():
             self._seq_stopflag = True