TSK-1823: add Docker Swarm instructions
TSK-1823: add Docker Swarm instructions

* add instrucitons for Docker Swarm
* dependencies on Python 3.6
* opcode bugs with Python 3.6

SKA-ScienceDataProcessor/algorithm-reference-library,SKA-ScienceDataProcessor/algorithm-reference-library,SKA-ScienceDataProcessor/algorithm-reference-library,SKA-ScienceDataProcessor/algorithm-reference-library,SKA-ScienceDataProcessor/algorithm-reference-library