L2SS-624: Add summarizing attributes for state, improve/fix boot procedure of various devices

tangostationcontrol/docs/source/devices/boot.rst

tangostationcontrol/docs/source/devices/using.rst

tangostationcontrol/docs/source/installation.rst

tangostationcontrol/tangostationcontrol/devices/apsct.py

tangostationcontrol/tangostationcontrol/devices/apspu.py

tangostationcontrol/tangostationcontrol/devices/boot.py

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

tangostationcontrol/tangostationcontrol/devices/recv.py

tangostationcontrol/tangostationcontrol/devices/sdp/sdp.py

tangostationcontrol/tangostationcontrol/devices/unb2.py

...ationcontrol/integration_test/devices/test_device_boot.py