[SPARK-7845] [BUILD] Bump "Hadoop 1" tests to version 1.2.1

https://issues.apache.org/jira/browse/SPARK-7845

Author: Yin Huai <yhuai@databricks.com>

Closes #6384 from yhuai/hadoop1Test and squashes the following commits:

82fcea8 [Yin Huai] Use hadoop 1.2.1 (a stable version) for hadoop 1 test.