[SPARK-4975][SQL] Fix HiveInspectorSuite test failure

[scwf]

HiveInspectorSuite test failure：
[info] - wrap / unwrap null, constant null and writables *** FAILED *** (21 milliseconds)
[info] 1 did not equal 0 (HiveInspectorSuite.scala:136)
this is because the origin date(is 3914-10-23) not equals the date returned by unwrap(is 3914-10-22).

Setting TimeZone and Locale fix this.
Another minor change here is rename def checkValues(v1: Any, v2: Any): Unit to def checkValue(v1: Any, v2: Any): Unit to make the code more clear

[SparkQA]

Test build #24843 has started for PR 3814 at commit 72b19a9.

• This patch merges cleanly.

[SparkQA]

Test build #24844 has started for PR 3814 at commit d8531ef.

• This patch merges cleanly.

[SparkQA]

Test build #24844 has finished for PR 3814 at commit d8531ef.

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

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/24844/
Test PASSed.

[SparkQA]

Test build #24843 has finished for PR 3814 at commit 72b19a9.

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

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/24843/
Test PASSed.

[marmbrus]

Thanks! Merged to master.