UniqueObject

create a class to be used for unique objects.
better for debugging and documentation than just using object()

+ remove unused unique objects

Change-Id: I32f65960ea2fbee4fccbeb49a4e11176b7185aa0
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/27455
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/lib/__init__.py

@@ -31,9 +31,6 @@ from configparser import ConfigParser
 from os import environ, path
 
 
-unset_value = object()
-
-
 class GeneralConfig:
     def __init__(self):
         self._config = None
@@ -319,3 +316,11 @@ def formatStatusBits(sword, labels, start=0):
         if sword & (1 << i) and lbl:
             result.append(lbl)
     return result
+
+
+class UniqueObject:
+    def __init__(self, name):
+        self.name = name
+
+    def __repr__(self):
+        return 'UniqueObject(%r)' % self.name