[SPARK-12228] [SQL] Try to run execution hive's derby in memory.

[yhuai]

This PR tries to make execution hive's derby run in memory since it is a fake metastore and every time we create a HiveContext, we will switch to a new one. It is possible that it can reduce the flakyness of our tests that need to create HiveContext (e.g. HiveSparkSubmitSuite). I will test it more.

https://issues.apache.org/jira/browse/SPARK-12228

[yhuai]

test this please

[yhuai]

test this please

[SparkQA]

Test build #47353 has finished for PR 10204 at commit 207895b.

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

[SparkQA]

Test build #47404 has finished for PR 10204 at commit 8546b8b.

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

[SparkQA]

Test build #47431 has finished for PR 10204 at commit bb05131.

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

[SparkQA]

Test build #47441 has started for PR 10204 at commit a4a84c1.

[yhuai]

test this please

[SparkQA]

Test build #47455 has finished for PR 10204 at commit a4a84c1.

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

[SparkQA]

Test build #47475 has finished for PR 10204 at commit 2cfa979.

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

[SparkQA]

Test build #47527 has finished for PR 10204 at commit c5294a9.

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

[marmbrus]

LGTM

[yhuai]

Thanks! Merging to master.