Agent shuts down after receiving SIGHUP

Describe the bug

Issuing a 'systemctl reload isc-stork-agent' results in the agent shutting down.

To Reproduce

Steps to reproduce the behavior:

1. Install Stork 1.1 Debian-style packages
2. Run 'systemctl reload isc-stork-agent'
3. Run 'journalctl -eu isc-stork-agent'

Expected behavior

The agent should re-read its configuration and apply any necessary changes.

Environment:

• Stork: 1.1.0.220202140042
• OS: Debian Bullseye

Additional Information

Example log output:

Feb 05 08:19:01 edge21-b systemd[1]: Reloading ISC Stork Agent...
Feb 05 08:19:01 edge21-b systemd[1]: Reloaded ISC Stork Agent.
Feb 05 08:19:01 edge21-b systemd[1]: isc-stork-agent.service: Deactivated successfully.
Feb 05 08:19:01 edge21-b systemd[1]: isc-stork-agent.service: Consumed 50min 17.876s CPU time.

Some initial questions

• Are you sure your feature is not already implemented in the latest Stork version? Yes.
• Are you sure what you would like to do is not possible using some other mechanisms? 'restart' can be used instead.
• Have you discussed your idea on stork-users mailing list? Yes.