Merge branch 'L2SS-358-add-apscu-apsct' of git.astron.nl:lofar2.0/tango into L2SS-358-add-apscu-apsct

Merge branch 'L2SS-358-add-apscu-apsct' of https://git.astron.nl/lofar2.0/tango into L2SS-358-add-apscu-apsct

Conflicts:
	CDB/recv-sim-config.json
	CDB/stations/LTS_ConfigDb.json
	CDB/unb2-sim-config.json
	devices/clients/opcua_client.py
	devices/devices/apsct.py
	devices/devices/apspu.py
	devices/devices/opcua_device.py
	devices/devices/recv.py
	devices/devices/unb2.py

L2SS-358: Make station ID optional, give simulators some XST/SST destination as they're mandatory, even though the simulators will never use their value. Remove superfluous port override in LTS config

L2SS-358: Load simulators by default, and describe how to load different stock station configurations

L2SS-358: Updated points of RECV/APSCT/APSPU/UNB2 to match new pypcc master. Updated grafana dashboard to match.

L2SS-358: Added APSCT and APSPU devices, their simulators. Added a common base image for the pypcc2 simulators. Separated station-dependend configs into separate CDB files. Added OPC-UA node path prefix to support instances with different paths to their nodes.

L2SS-412: Use asyncio for opcua and other clients

Closes L2SS-412

See merge request !142

Resolve L2SS-395 "11 10 2021 read sdp firmware status"

Closes L2SS-395

See merge request !156

L2SS-412: Force installation of dependencies in integration test and unit test through 'tox --recreate'. Moved test dependencies from itango to test-requirements.txt.

L2SS-391: Add boot device

Closes L2SS-391

See merge request !144

L2SS-434: Add sphinx documentation content

Closes L2SS-434

See merge request !150

L2SS-358: Updated points of RECV/APSCT/APSPU/UNB2 to match new pypcc master. Updated grafana dashboard to match.

Resolve L2SS-409 "Fix shellcheck ci"

Closes L2SS-409

See merge request !151

L2SS-409: Ignore shebangs not working with more than one parameter on some OSes. We don't use those OSes, and don't want to lose this functionality.