Add tests for read_modify_write of lofar_device_proxy
Adds tests around the use of read_modify_write to allow for atomic and masked updates of attributes. This prevents overriding existing values. Closes L2SS-940
Edited by Corné Lukken
Adds tests around the use of read_modify_write to allow for atomic and masked updates of attributes. This prevents overriding existing values. Closes L2SS-940