[SPARK-21138][YARN] Cannot delete staging dir when the clusters of "spark.yarn.stagingDir" and "spark.hadoop.fs.defaultFS" are different

## What changes were proposed in this pull request?

When I set different clusters for "spark.hadoop.fs.defaultFS" and "spark.yarn.stagingDir" as follows：
```
spark.hadoop.fs.defaultFS  hdfs://tl-nn-tdw.tencent-distribute.com:54310
spark.yarn.stagingDir hdfs://ss-teg-2-v2/tmp/spark
```
The staging dir can not be deleted, it will prompt following message:
```
java.lang.IllegalArgumentException: Wrong FS: hdfs://ss-teg-2-v2/tmp/spark/.sparkStaging/application_1496819138021_77618, expected: hdfs://tl-nn-tdw.tencent-distribute.com:54310
```

## How was this patch tested?

Existing tests

Author: sharkdtu <sharkdtu@tencent.com>

Closes #18352 from sharkdtu/master.