receive_secure_serial: unchanged (why?)

[Jukka Pakkanen]

While sorting out this latest DNSSEC problem, autosign not autosigning, this other older *cosmetic* problem would be nice to have fixed too...

Windows Event Viewer filling with these error messages, which I think are not actual errors, should be more like warnings or notifications.  When the named service is restarted, every signed zone gives this "error" message:

zone qnet.fi/IN (signed): receive_secure_serial: unchanged
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