[SPARK-5193][SQL] Remove Spark SQL Java-specific API.

[rxin]

After the following patches, the main (Scala) API is now usable for Java users directly.

#4056
#4054
#4049
#4030
#3965
#3958

[SparkQA]

Test build #25625 has started for PR 4065 at commit c4ae1c5.

• This patch merges cleanly.

[rxin]

cc @mengxr @jkbradley for mllib changes.

[SparkQA]

Test build #25626 has started for PR 4065 at commit ba3bfa2.

• This patch merges cleanly.

[SparkQA]

Test build #25625 has finished for PR 4065 at commit c4ae1c5.

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

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[SparkQA]

Test build #25626 has finished for PR 4065 at commit ba3bfa2.

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

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[SparkQA]

Test build #25632 has started for PR 4065 at commit 500d2c4.

• This patch merges cleanly.

[SparkQA]

Test build #25632 has finished for PR 4065 at commit 500d2c4.

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• This patch adds no public classes.

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[SparkQA]

Test build #25636 has started for PR 4065 at commit e9f1de3.

• This patch merges cleanly.

[mengxr]

MLlib changes look good to me:)

[jkbradley]

Same here; ML updates LGTM

[SparkQA]

Test build #25636 has finished for PR 4065 at commit e9f1de3.

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• This patch adds no public classes.

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[SparkQA]

Test build #25643 has started for PR 4065 at commit 83735da.

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[SparkQA]

Test build #25643 has finished for PR 4065 at commit 83735da.

• This patch fails PySpark unit tests.
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• This patch adds no public classes.

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[SparkQA]

Test build #25674 has started for PR 4065 at commit 3e53f91.

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[SparkQA]

Test build #25674 has finished for PR 4065 at commit 3e53f91.

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[SparkQA]

Test build #25680 has started for PR 4065 at commit e8f1455.

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[SparkQA]

Test build #25680 has finished for PR 4065 at commit e8f1455.

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• This patch adds no public classes.

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[SparkQA]

Test build #25690 has started for PR 4065 at commit 6d86578.

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Test build #25690 has finished for PR 4065 at commit 6d86578.

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[SparkQA]

Test build #25692 has started for PR 4065 at commit b1fd860.

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[SparkQA]

Test build #25692 has finished for PR 4065 at commit b1fd860.

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[rxin]

Ok merging in master!