doc: Update topotest doc to include iptables is needed #16679
Merged
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The nhrp tests skip tests that do not have iptables installed. As such we have ended up with a situation where the nrhp test is now failing locally for me because I have iptables installed and if the CI system had iptables installed it would have detected the problem as well.
Let's document that iptables is needed to do testing.