Migrate from station client to lotus

...ostationcontrol/tangostationcontrol/rpc/messagehandler.py

tangostationcontrol/tangostationcontrol/rpc/server.py

...gostationcontrol/toolkit/generate_caltable_from_lofar1.py

tangostationcontrol/test-requirements.txt

tangostationcontrol/test/clients/test_snmp_client.py

...control/test/common/events/test_register_subscriptions.py

tangostationcontrol/test/common/proxy/test_create_proxies.py

...trol/test/devices/base_device_classes/test_beam_device.py

...rol/test/devices/base_device_classes/test_opcua_device.py

...tationcontrol/test/devices/test_station_manager_device.py

tangostationcontrol/test/metadata/test_metadata_organizer.py

tangostationcontrol/test/opcua.py

tangostationcontrol/test/protection/test_config_types.py

tangostationcontrol/test/protection/test_metrics.py

...stationcontrol/test/protection/test_protection_manager.py

tangostationcontrol/test/rpc/test_messagehandler.py

tangostationcontrol/tox.ini