Merge branch 'L2SS-622-store-attribute-io-per-device' into 'master'

tangostationcontrol/tangostationcontrol/clients/README.md

...ncontrol/tangostationcontrol/clients/attribute_wrapper.py

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

...stationcontrol/tangostationcontrol/clients/snmp_client.py

...ationcontrol/tangostationcontrol/devices/docker_device.py

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

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

tangostationcontrol/tangostationcontrol/devices/psoc.py

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

...n_test/default/client/test_opcua_client_against_server.py

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

...oncontrol/tangostationcontrol/test/clients/test_client.py

...rol/tangostationcontrol/test/clients/test_opcua_client.py