[SPARK-16858] [SQL] [TEST] Removal of TestHiveSharedState

[gatorsmile]

What changes were proposed in this pull request?

This PR is to remove TestHiveSharedState.

Also, this is also associated with the Hive refractoring for removing HiveSharedState.

How was this patch tested?

The existing test cases

[rxin]

LGTM pending Jenkins.

[SparkQA]

Test build #63130 has finished for PR 14463 at commit 30e2f6e.

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

[gatorsmile]

The test failure is caused by the fact that SharedState is not being shared between different sessions. Since we define our own TestHiveSparkSession in TestHive (i.e., not directly using SparkSession), we still need extra logics to sharing/passing the SharedState between different sessions.

Now, we can remove the TestHiveSharedState, but we still need to explicitly have a HiveSharedState.

[gatorsmile]

Updated the PR description.

[SparkQA]

Test build #63134 has finished for PR 14463 at commit dc98d5d.

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

[gatorsmile]

@rxin @yhuai The code is ready for review. Thanks!

[rxin]

Merging in master.