Merge branch 'L2SS-770-fix-pyflakes-linting-errors' into 'master'

...tationcontrol/tangostationcontrol/clients/opcua_client.py

tangostationcontrol/tangostationcontrol/common/measures.py

tangostationcontrol/tangostationcontrol/devices/apsct.py

tangostationcontrol/tangostationcontrol/devices/boot.py

...stationcontrol/tangostationcontrol/devices/observation.py

...ontrol/tangostationcontrol/devices/observation_control.py

tangostationcontrol/tangostationcontrol/devices/recv.py

tangostationcontrol/tangostationcontrol/devices/tilebeam.py

...tangostationcontrol/examples/load_from_disk/ini_device.py

...control/integration_test/default/toolkit/test_archiver.py

...ioncontrol/statistics_writer/udp_dev/udp_write_manager.py

...ationcontrol/tangostationcontrol/test/beam/test_delays.py

...rol/tangostationcontrol/test/clients/test_attr_wrapper.py

tangostationcontrol/tox.ini