[SPARK-4966][YARN]The MemoryOverhead value is setted not correctly

Author: meiyoula <1039320815@qq.com>

Closes #3797 from XuTingjun/MemoryOverhead and squashes the following commits:

5a780fc [meiyoula] Update ClientArguments.scala

(cherry picked from commit 14fa87bdf4b89cd392270864ee063ce01bd31887)
Signed-off-by: Thomas Graves <tgraves@apache.org>