S2couple19: Gongchuga Indo18 Install

[Service] Type=simple User=s2svc Group=s2svc WorkingDirectory=/opt/s2couple/gongchuga-indo18 ExecStart=/opt/s2couple/venv/bin/python /opt/s2couple/gongchuga-indo18/agent.py --config /etc/gongchuga.conf Restart=on-failure