MAPREDUCE-5221

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
MAPREDUCE-5221 v2

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
MAPREDUCE-5221 v3

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
moved test files to mapred.TestReduceTask

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Removed timeout to pass test correctly.

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
added test to TestMRAppWithCombiner

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>
Deleted a needless comment line.

Signed-off-by: Tsuyoshi Ozawa <ozawa.tsuyoshi@gmail.com>