[SPARK-17007][SQL] Move test data files into a test-data folder

[petermaxlee]

What changes were proposed in this pull request?

This patch moves all the test data files in sql/core/src/test/resources to sql/core/src/test/resources/test-data, so we don't clutter the top level sql/core/src/test/resources. Also deleted sql/core/src/test/resources/old-repeated.parquet since it is no longer used.

The change will make it easier to spot sql-tests directory.

How was this patch tested?

This is a test-only change.

[SparkQA]

Test build #63571 has finished for PR 14589 at commit 17bc9c0.

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

[SparkQA]

Test build #63573 has finished for PR 14589 at commit 3bc7c03.

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

[rxin]

Thanks - merging in master.

[srowen]

Seems OK, but src/test/resources was already only a "test data" dir by nature. I don't think this helped anything.

[cloud-fan]

backport to 2.0!

[srowen]

@cloud-fan why backport into a maintenance release?

[rxin]

@srowen there are bug fixes that are tested by this new harness (technically not super relevant to this pr though, but all those files are in the same resources directory).

[srowen]

I see. This is also why I would not have made this change. Can you leave these open for >= 1 day if it's not an emergency? last week I saw a JIRA + PR opened and closed in 2 hours. We should try not to