MAPREDUCE-5911. Terasort TeraOutputFormat does not check for output directory existance. Contributed by Bruno P. Kinoshita.
(cherry picked from commit 7bbda6ef92e9bf4a28e67b8736067b38defab51e)
Revert "MAPREDUCE-5911. Terasort TeraOutputFormat does not check for output directory existance. Contributed by Bruno P. Kinoshita."

This reverts commit 71e05b190050aac2fa8ed6d7d6ad023a275c0f1e.