[SPARK-20609][MLLIB][TEST] manually cleared 'spark.local.dir' before/after a...

[SPARK-20609][MLLIB][TEST] manually cleared 'spark.local.dir' before/after a test in ALSCleanerSuite

## What changes were proposed in this pull request?

This PR is similar to #17869.
Once` 'spark.local.dir'` is set. Unless this is manually cleared before/after a test. it could return the same directory even if this property is configured.
and add before/after for each likewise in ALSCleanerSuite.

## How was this patch tested?
existing test.

Author: caoxuewen <cao.xuewen@zte.com.cn>

Closes #18537 from heary-cao/ALSCleanerSuite.