[SPARK-15805][SQL][Documents] update sql programming guide for spark 2.0 including all scala/java/python code in the guide

[WeichenXu123]

What changes were proposed in this pull request?

Update the whole sql programming guide doc file , including:
update doc with SparkSession instead of SQLContext
update doc with SparkSession.builder.enableHiveSupport instead of HiveContext
update doc with dataFrame.write.saveAsTable instead of dataFrame.saveAsTable
update doc with SparkSession.catalog.cacheTable/uncacheTable instead of SQLContext.cacheTable/uncacheTable
update doc with dataFrame.createOrReplaceTempView instead of dataFrame.registerTempTable
update doc with SparkSession.config instead of SQLContext.setConf
update doc with SparkSession.catalog.refreshTable instead of SQLContext.refreshTable

and so on...

How was this patch tested?

N/A

[SparkQA]

Test build #60129 has finished for PR 13544 at commit 770abc5.

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

[rxin]

cc @liancheng

[SparkQA]

Test build #60143 has finished for PR 13544 at commit 20bff4b.

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

[SparkQA]

Test build #60147 has finished for PR 13544 at commit e86119e.

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

[SparkQA]

Test build #60158 has finished for PR 13544 at commit 254ea7f.

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

[liancheng]

Ah, too bad... I wasn't aware of this PR when I was doing #13592. Will review this one to see whether I missed something in #13592. Thanks for working on this!

[WeichenXu123]

@liancheng OK, no problem !