Merge branch 'feat/266-cttc-e2e-orchestrator-subscription-on-device-added-using-socketio' into 'feat/216-cttc-implement-integration-test-between-e2e-ip-optical-sdn-controllers'

Resolve "(CTTC) Update recommendations to use SocketIO on NBI and E2E Orch components"

See merge request !328