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dns: coerce port to number in lookupService

Rodrigo Muino Tomonari requested to merge github/fork/evanlucas/dnsnet-internal2 into master

Previously, port could be any number in dns.lookupService. This change throws a TypeError if port is outside the range of 0-65535. It also coerces the port to a number.

This includes the commit from https://github.com/nodejs/node/pull/4882 as it depends on it.

I have separated them into two PRs for the sake of cherry-picking to release branches though as this is semver-major.

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