update hadoop dependency to 2.4.0
Merge remote-tracking branch 'origin' into yingdac_updatehadoop_846
Merge remote-tracking branch 'origin' into yingdac_updatehadoop_846
use the KeepContainersAcrossApplicationAttempts=true for driver submission, so that we can keep evaluators running when driver crashes
Merge pull request #847 from Microsoft-CISL/yingdac_updatehadoop_846

update hadoop dependency to 2.4.0