[MCCS-659] MR feedback

src/ska_tango_base/base/admin_mode_model.py

src/ska_tango_base/base/base_device.py

src/ska_tango_base/base/op_state_model.py

src/ska_tango_base/base/reference_component_manager.py

src/ska_tango_base/subarray/reference_component_manager.py

src/ska_tango_base/subarray/subarray_device.py

tests/test_base_device.py