1）add UT to DataProfile.java and YarnDAGProfile.java
2) complete the methods findJobHistoryProfile(String jobName ,String inputPath) and    getDataProfile(String inputPath)
3) add method getDataInfo(String inputPath) and getDataInfo(FileSystem fs, String    inputPath) to DataProfile.java
Merge pull request #6 from maplehua/addTest

1）add UT to DataProfile.java and YarnDAGProfile.java