[SPARK-22544][SS] FileStreamSource should use its own hadoop conf to call globPathIfNecessary

## What changes were proposed in this pull request?

Pass the FileSystem created using the correct Hadoop conf into `globPathIfNecessary` so that it can pick up user's hadoop configurations, such as credentials.

## How was this patch tested?

Jenkins

Author: Shixiong Zhu <zsxwing@gmail.com>

Closes #19771 from zsxwing/fix-file-stream-conf.