SPARK-25043: print master and appId from spark-sql on startup

[abellina]

What changes were proposed in this pull request?

A small change to print the master and appId from spark-sql as with logging turned down all the way (log4j.logger.org.apache.spark.sql.hive.thriftserver.SparkSQLCLIDriver=WARN), we may not know this information easily. This adds the following string before the spark-sql> prompt shows on the screen.

Spark master: yarn, Application Id: application_123456789_12345

How was this patch tested?

I ran spark-sql locally and saw the appId displayed as expected.

Please review http://spark.apache.org/contributing.html before opening a pull request.

[tgravescs]

ok to test

[SparkQA]

Test build #94442 has finished for PR 22025 at commit 42c510c.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #94497 has finished for PR 22025 at commit c651373.

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

[tgravescs]

+1

[HyukjinKwon]

@abellina, how is the output like? mind if I ask put it in the PR description just to make the review easier if that's not hard?

[abellina]

@HyukjinKwon I have updated the description. Thanks for the comment.

[tgravescs]

merged to master, thanks @abellina