Added custom LofarDeviceProxy to enhance support for high-dimensional arrays in attribtues

tests/test_devices.py

@@ -73,10 +73,13 @@ class LofarDeviceProxyTest(base.TestCase):
         )
 
         cls.context.start()
-        cls.addClassCleanup(cls.context.stop)
-
         cls.proxy = LofarDeviceProxy(cls.context.get_device_access("STAT/MyDevice/1"))
 
+    @classmethod
+    def tearDownClass(cls):
+        # In Python3.8+, we can use addClassCleanup instead
+        cls.context.stop()
+
     def test_read_scalar(self):
         value = self.proxy.scalar