Add simulation mode to model validation

[joshuazh-x]

Add simulation mode to validate-model.sh, which will randomly walk in the state machine and is helpful for finding issues quickly.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @joshuazh-x. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[ahrtr]

/ok-to-test

[ahrtr]

Minor improvement

args=(
  -config "${config}"
  "${spec}"
  -lncheck final
  -metadir "${statedir}"
  -fpmem 0.9
  -workers auto
)

if [ "$sim" = true ]; then
  args+=(-simulate)
fi

java -XX:+UseParallelGC -cp "${tooldir}/tla2tools.jar:${tooldir}/CommunityModules-deps.jar" tlc2.TLC "${args[@]}"