[SPARK-20338][CORE]Spaces in spark.eventLog.dir are not correctly handled

[zuotingbing]

What changes were proposed in this pull request?

“spark.eventLog.dir” supports with space characters.

1. Update EventLoggingListenerSuite like testDir = Utils.createTempDir(namePrefix = s"history log")
2. Fix EventLoggingListenerSuite tests

How was this patch tested?

update unit tests

[vanzin]

ok to test

[SparkQA]

Test build #78130 has finished for PR 18285 at commit a037917.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #78144 has finished for PR 18285 at commit 536a445.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[vanzin]

LGTM, merging to master.

[zuotingbing]

Thanks @vanzin !