Merge branch 'master' into L2SS-523-delay-calibration-table

.gitlab-ci.yml

docker-compose/itango/Dockerfile

...ioncontrol/tangostationcontrol/devices/abstract_device.py

...tationcontrol/tangostationcontrol/devices/lofar_device.py

...tationcontrol/tangostationcontrol/devices/opcua_device.py

...tioncontrol/tangostationcontrol/devices/sdp/statistics.py

tangostationcontrol/tangostationcontrol/devices/sdp/xst.py

.../tangostationcontrol/test/devices/test_abstract_device.py

...angostationcontrol/test/devices/test_statistics_device.py