Add in timeout option to default socat "/opt/start.sh"

[dbrumley]

Right now we have no default timeout for socat, so if someone connects but never sends anything (or the problem is expecting a certain number of reads, but they don't happen), the process won't end. This can quickly use up PIDs for the container (default for me is 20).

Solution would be to add to the default "socat -T60" (60 seconds) or "socat -T600" (5 minutes, probably more reasonable) to the examples. This will help ensure contributors are pushing stable challenges.