[SPARK-10643][CORE] Make spark-submit download remote files to local in client mode

## What changes were proposed in this pull request?

This PR makes spark-submit script download remote files to local file system for local/standalone client mode.

## How was this patch tested?

- Unit tests
- Manual tests by adding s3a jar and testing against file on s3.

Please review http://spark.apache.org/contributing.html before opening a pull request.

Author: Yu Peng <loneknightpy@gmail.com>

Closes #18078 from loneknightpy/download-jar-in-spark-submit.