Merge branch 'stable' into develop

.drone.yml

.gitignore

INSTALL.md

Makefile

README.md

client-test

config/opennsa.conf.template

config/opennsa.nrm

docker-compose.override.yml_placeholder

docker-compose.yml

docker/Dockerfile

docker/README.md

docker/create-compose

docker/env.sh

docker/run_opennsa.sh

docker/template.yml

docs/GFD.237.pdf

docs/migration.md

docs/ncs.md

docs/test.md