Peer selection bugfix and testing updates #5209
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Changes address the issue of peer selection not taking the opportunity to demote peers, or demoting too many under specific conditions.
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Description
A bug in established & active above targets caused missed opportunities to demote a peer.
testnet bugfix: prop_diffusion_target_active_below: A missed promotion opportunity is signalled causing
IOSim.target active belowtest to fail while the peer is being synchronously demoted from warm state and hence is not a viable opportunity.Reworked approach to peer selection tests.
resolves #5206
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Quality
Maintenance
ouroboros-networkproject.