Add a command to chutney and test-network.sh that prints the default option values
Follow up to legacy/trac#30059 (moved).
We should make a chutney command and a test-network.sh command that prints their default option values.
Maybe we could even import the defaults from chutney into test-network.sh.
Then we can update the README to say: "For the default values of these options, run..."
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