Implement docker ulimits #825
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Fix #824
In this implementation both soft & hard limits will be set to rlimit.max (or 2^20, whichever is lower) because by default unix.rlimit returns the limits of the current process (containerlab binary in this case).
I assume that should be good enough, but if we encounter any issues (someone runs clab on a system with a very low rlimit.max? which is unlikely) we can rework the logic.