[Enhancement] Systemd support

[FossPrime]

This works... but we probably shouldn't use the root user. We may have to change the dory code that looks for the currently logged in user. It's probably safe to depend on useradd.

[Unit]
Description=Dory dns and nginx access to containers
Requires=docker.service
After=docker.service

[Service]
User=root
Type=oneshot
RemainAfterExit=yes
WorkingDirectory=/root
ExecStart=/usr/local/bin/dory up   
ExecStop=/usr/local/bin/dory down
TimeoutStartSec=0

[Install]
WantedBy=multi-user.target