tools: open `test.tap` file in write-binary mode

tools: open `test.tap` file in write-binary mode · nodejs/node@69e7b87

tools: open test.tap file in write-binary mode

By default the logfile is opened in append mode. This commit makes sure that the file is opened in write-binary mode, so that the file will be created if it doesn't exist or overwrite if it exists. Fixes: #2834 PR-URL: #2837 Reviewed-By: Johan Bergström <bugs@bergstroem.nu> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Rod Vagg <rod@vagg.org> Reviewed-By: Alexis Campailla <orangemocha@nodejs.org>

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