L2SS-574: fix linting

tangostationcontrol/tangostationcontrol/test/devices/test_beam_device.py

@@ -7,16 +7,13 @@
 # Distributed under the terms of the APACHE license.
 # See LICENSE.txt for more info.
 
-from tango import DevState
 from tango.test_context import DeviceTestContext
 
-from tangostationcontrol.devices import beam, recv, lofar_device
+from tangostationcontrol.devices import beam, lofar_device
 
-import numpy
 import mock
 
 from tangostationcontrol.test import base
-from tangostationcontrol.integration_test.device_proxy import TestDeviceProxy
 
 class TestBeamDevice(base.TestCase):