Demo: Race condition between demo Primary & Secondary in timeserver attestation validation

[awwad]

The following message is produced occasionally on the demo Secondary during normal operation in the demo, if the demo Primary and Secondary are involved in continuously looping, asymmetric updates:

Timeserver attestation from Primary does not check out: This Secondary's nonce was not found. Not updating this Secondary's time this cycle.

This is not a particularly important event, as it can occur that the Secondary doesn't update its time occasionally, but I want to ensure that there isn't a problematic race condition here. I would have expected the design to systematically avoid this.