When running test plans on testground as a service, logs are saved in a file within the testground daemon datadir.

Logs are supposed to be a replication of what is returned to the daemon with ow *rpc.OutputWriter (https://github.com/testground/testground/blob/master/pkg/runner/cluster_k8s.go#L151), but is not the case.

This is reproducible with the deals-stress-concurrent-natural-k8s.toml composition from Oni, or just by triggering an hour build on the Oni repo.