testnet: reduce log length significantly, by not logging the config #5701
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Description
When a test runs, we log its ExecConfig which contains the full environment of the shell it runs in.
As a consequence, on Nix, the output log is polluted with a gigantic line of the form (there are actually multiple screens of output like this, only showing 1):
What this PR does
This PR removes logging the
ExecConfig
value, as it's making harder to find other valuable info.Checklist