L2SS-1986: Process new requirements and fix bugs

README.md

tangostationcontrol/VERSION

...on_test/default/devices/test_device_protection_control.py

...control/tangostationcontrol/devices/protection_control.py

...ostationcontrol/tangostationcontrol/protection/metrics.py

...trol/tangostationcontrol/protection/protection_manager.py

tangostationcontrol/tangostationcontrol/protection/state.py

...tationcontrol/tangostationcontrol/protection/threshold.py

tangostationcontrol/test/protection/test_threshold.py

tangostationcontrol/tox.ini