chore: make DistributedRunner use random ports by default#919
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Makes DistributedRunner use random ports by default, (random ports will be chosen when the master port/ worker ports are set to 0). Suffers from a minor TOCTOU problem, but we retry up to three times, so this should not be a problem in practice. The current default port of 29500 conflicts with other packages' default like pytorch distributed/ accelerate launch commands.