## What changes were proposed in this pull request?

Add Catalog.refreshTable API into python interface for Spark-SQL.

## How was this patch tested?

Existing test.

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #13558 from WeichenXu123/update_python_sql_interface_refreshTable.

[SPARK-15464][ML][MLLIB][SQL][TESTS] Replace SQLContext and SparkContext with SparkSession using builder pattern in python test code

## What changes were proposed in this pull request?

Replace SQLContext and SparkContext with SparkSession using builder pattern in python test code.

## How was this patch tested?

Existing test.

Author: WeichenXu <WeichenXu123@outlook.com>

Closes #13242 from WeichenXu123/python_doctest_update_sparksession.

## What changes were proposed in this pull request?

Deprecates registerTempTable and add dataset.createTempView, dataset.createOrReplaceTempView.

## How was this patch tested?

Unit tests.

Author: Sean Zhong <seanzhong@databricks.com>

Closes #12945 from clockfly/spark-15171.

## What changes were proposed in this pull request?

Addresses comments in #12765.

## How was this patch tested?

Python tests.

Author: Andrew Or <andrew@databricks.com>

Closes #12784 from andrewor14/python-followup.

## What changes were proposed in this pull request?

The `catalog` and `conf` APIs were exposed in `SparkSession` in #12713 and #12669. This patch adds those to the python API.

## How was this patch tested?

Python tests.

Author: Andrew Or <andrew@databricks.com>

Closes #12765 from andrewor14/python-spark-session-more.