feat(sysctl): add controls for enabling/disabling sync versions #869
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Motivation
If during the sync-v2 trial period we end up in a situation where sync-v2 fails to advance, working around this would require at the very least a node restart, but usually in practice a re-deploy. With this change it is now possible to enable sync-v1 and disable sync-v2 in runtime without restarting a node.
Acceptance Criteria
p2p.available_sync_versions(readonly) andp2p.enabled_sync_versions(read-write)Checklist
master, confirm this code is production-ready and can be included in future releases as soon as it gets merged