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test: add uv threadpool congestion regression test

Rodrigo Muino Tomonari requested to merge github/fork/gireeshpunathil/uv-threadpool-schedule into master

Validate that massive dns lookups do not block filesytem I/O (or any fast I/O for that matter). Prior to https://github.com/libuv/libuv/pull/1845 few back-to-back dns lookup were sufficient to engage libuv threadpool workers in a blocking manner, throttling other work items that need the pool. this test acts as a regression test for the same.

Start slow and fast I/Os together, and make sure fast I/O can complete in at least in 1/100th of time for slow I/O.

Refs: https://github.com/libuv/libuv/pull/1845 Refs: https://github.com/nodejs/node/issues/8436

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

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