This fixes missing agent sections when users upgrade from a 1.6.0 systemd Checkmk agent package to a 2.0.0 xinetd package.
Since from 1.6.0 to 2.0.0 we changed the default network service from xinetd to systemd, this is a very rare scenario.
In case it did happen the systemd socket was not stopped during the upgrade, preventing the xinetd service from binding to the port.
This resulted in a partially working monitoring (as the systemd socked was running).
However, services using chached data would go to stale (e.g. "NTP Time") and the agent updater would no longer be triggered.
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