argument_spec is now not merged from middleclasses

plugins/module_utils/module.py

@@ -40,7 +40,11 @@ class AnsibleModule(object):
         self.result = dict(changed=False)
         specs = dict()
         specs.update(self._common_args)
-        specs.update(self.module_spec)
+        modspec = self.module_spec.copy()
+        if "argument_spec" in modspec and "argument_spec" in self._common_args:
+            specs["argument_spec"].update(modspec["argument_spec"])
+            del modspec["argument_spec"]
+        specs.update(modspec)
         self.module = basic.AnsibleModule(**specs)
         self.tmpdir = pathlib.Path(self.module.tmpdir)