core: move module handling out of dispatcher

Split module handling code from the dispatcher.
The new class for managing Modules is called SecNode.

* change logging to no longer need a reference to modobj
* modules get a reference to the secnode obj instead of the
  dispatcher
* intermediate usage fixes for frappy_psi/sea

Change-Id: Ifee4bb47aa7a4508bb4a47c9a5873b7e2d5faf67
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/32249
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>

frappy/modules.py

@@ -940,8 +940,12 @@ class Attached(Property):
     def __get__(self, obj, owner):
         if obj is None:
             return self
-        if self.name not in obj.attachedModules:
-            modobj = obj.DISPATCHER.get_module(super().__get__(obj, owner))
+        modobj = obj.attachedModules.get(self.name)
+        if not modobj:
+            modulename = super().__get__(obj, owner)
+            if not modulename:
+                return None  # happens when mandatory=False and modulename is not given
+            modobj = obj.secNode.get_module(modulename)
             if not isinstance(modobj, self.basecls):
                 raise ConfigError(f'attached module {self.name}={modobj.name!r} '\
                     f'must inherit from {self.basecls.__qualname__!r}')