Add tools to generate domain names leveraging ggc.txt and iata.txt

tools/gen-1e100.sh

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+awk '{print $1}' ../data/iata.txt | xargs -n 1 ./list-1e100.py > 1e100-all.txt

tools/gen-sn.sh

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+awk '{print $2}' ../data/iata.txt | xargs -n 1 ./list-sn.py > sn-all.txt