test: remove flaky test functionality

Reverts https://github.com/joyent/node/pull/8689

PR-URL: https://github.com/iojs/io.js/pull/812


Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>