No need to preserve UUID across node resets.

The only case where UUID persistence matters is on storage nodes, and it
is already restored from database if available.

neo/tests/threaded/__init__.py

@@ -234,7 +234,6 @@ class ServerNode(Node):
     def resetNode(self):
         assert not self.isAlive()
         kw = self._init_args
-        kw['getUUID'] = self.uuid
         self.__dict__.clear()
         self.__init__(**kw)