## What changes were proposed in this pull request?
Made the SPARK YARN STAGING DIR as configurable with the configuration as 'spark.yarn.staging-dir'.

## How was this patch tested?

I have verified it manually by running applications on yarn, If the 'spark.yarn.staging-dir' is configured then the value used as staging directory otherwise uses the default value i.e. file system’s home directory for the user.

Author: Devaraj K <devaraj@apache.org>

Closes #12082 from devaraj-kavali/SPARK-13063.