[SPARK-15307][SQL] speed up listing files for data source

## What changes were proposed in this pull request?

Currently, listing files is very slow if there is thousands files, especially on local file system, because:
1) FileStatus.getPermission() is very slow on local file system, which is launch a subprocess and parse the stdout.
2) Create an JobConf is very expensive (ClassUtil.findContainingJar() is slow).

This PR improve these by:
1) Use another constructor of LocatedFileStatus to avoid calling FileStatus.getPermission, the permissions are not used for data sources.
2) Only create an JobConf once within one task.

## How was this patch tested?

Manually tests on a partitioned table with 1828 partitions, decrease the time to load the table from 22 seconds to 1.6 seconds (Most of time are spent in merging schema now).

Author: Davies Liu <davies@databricks.com>

Closes #13094 from davies/listing.