[SPARK-21714][CORE][YARN] Avoiding re-uploading remote resources in yarn client mode

## What changes were proposed in this pull request?

With SPARK-10643, Spark supports download resources from remote in client deploy mode. But the implementation overrides variables which representing added resources (like `args.jars`, `args.pyFiles`) to local path, And yarn client leverage this local path to re-upload resources to distributed cache. This is unnecessary to break the semantics of putting resources in a shared FS. So here proposed to fix it.

## How was this patch tested?

This is manually verified with jars, pyFiles in local and remote storage, both in client and cluster mode.

Author: jerryshao <sshao@hortonworks.com>

Closes #18962 from jerryshao/SPARK-21714.