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dns: throw a TypeError in lookupService with invalid port

Rodrigo Muino Tomonari requested to merge github/fork/evanlucas/fixdnslookupService into master

Previously, port was assumed to be a number and would cause an abort in cares_wrap. This change throws a TypeError if port is not a number before we actually hit C++.

Fixes: https://github.com/nodejs/node/issues/4837

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