[SPARK-22672][TEST][SQL] Move OrcTest to sql/core

[dongjoon-hyun]

What changes were proposed in this pull request?

To support ORC tests without Hive, we had better have OrcTest in sql/core instead of sql/hive.

How was this patch tested?

This is a test suite only change. It should pass all existing tests.

[SparkQA]

Test build #84381 has finished for PR 19863 at commit a58ceba.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
• abstract class OrcTest extends QueryTest with SQLTestUtils
• class OrcFilterSuite extends OrcTest with TestHiveSingleton
• class OrcQuerySuite extends OrcTest with TestHiveSingleton with BeforeAndAfterAll

[gatorsmile]

When we have not moved the test suites of ORC, why we need to move this out of Hive now?

[dongjoon-hyun]

Unlike the previous ORC PRs, #19651 intentionally uses the existing old Hive tests suites. This PR is a preparation for moving test cases.

[gatorsmile]

Since this PR is tiny, we can do it when the other PRs are merged.

[dongjoon-hyun]

As you see, we can do this without merging other ORC PRs, and this will reduce the scope of review for the other PRs.

[dongjoon-hyun]

@gatorsmile . Since the main PR is merged, I'll include this into the others. Thanks!