[SPARK-3646][SQL] Copy SQL configuration from SparkConf when a SQLContext is created.

This will allow us to take advantage of things like the spark.defaults file.

Author: Michael Armbrust <michael@databricks.com>

Closes #2493 from marmbrus/copySparkConf and squashes the following commits:

0bd1377 [Michael Armbrust] Copy SQL configuration from SparkConf when a SQLContext is created.
[SPARK-3647] Add more exceptions to Guava relocation.

Guava's Optional refers to some package private classes / methods, and
when those are relocated the code stops working, throwing exceptions.
So add the affected classes to the exception list too, and add a unit
test.

(Note that this unit test only really makes sense in maven, since we
don't relocate in the sbt build. Also, JavaAPISuite doesn't seem to
be run by "mvn test" - I had to manually add command line options to
enable it.)

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #2496 from vanzin/SPARK-3647 and squashes the following commits:

84f58d7 [Marcelo Vanzin] [SPARK-3647] Add more exceptions to Guava relocation.
SPARK-3612. Executor shouldn't quit if heartbeat message fails to reach ...

...the driver

Author: Sandy Ryza <sandy@cloudera.com>

Closes #2487 from sryza/sandy-spark-3612 and squashes the following commits:

2b7353d [Sandy Ryza] SPARK-3612. Executor shouldn't quit if heartbeat message fails to reach the driver
[SPARK-3653] Respect SPARK_*_MEMORY for cluster mode

`SPARK_DRIVER_MEMORY` was only used to start the `SparkSubmit` JVM, which becomes the driver only in client mode but not cluster mode. In cluster mode, this property is simply not propagated to the worker nodes.

`SPARK_EXECUTOR_MEMORY` is picked up from `SparkContext`, but in cluster mode the driver runs on one of the worker machines, where this environment variable may not be set.

Author: Andrew Or <andrewor14@gmail.com>

Closes #2500 from andrewor14/memory-env-vars and squashes the following commits:

6217b38 [Andrew Or] Respect SPARK_*_MEMORY for cluster mode
[SPARK-1853] Show Streaming application code context (file, line number) in Spark Stages UI

This is a refactored version of the original PR https://github.com/apache/spark/pull/1723 my mubarak

Please take a look andrewor14, mubarak

Author: Mubarak Seyed <mubarak.seyed@gmail.com>
Author: Tathagata Das <tathagata.das1565@gmail.com>

Closes #2464 from tdas/streaming-callsite and squashes the following commits:

dc54c71 [Tathagata Das] Made changes based on PR comments.
390b45d [Tathagata Das] Fixed minor bugs.
904cd92 [Tathagata Das] Merge remote-tracking branch 'apache-github/master' into streaming-callsite
7baa427 [Tathagata Das] Refactored getCallSite and setCallSite to make it simpler. Also added unit test for DStream creation site.
b9ed945 [Mubarak Seyed] Adding streaming utils
c461cf4 [Mubarak Seyed] Merge remote-tracking branch 'upstream/master'
ceb43da [Mubarak Seyed] Changing default regex function name
8c5d443 [Mubarak Seyed] Merge remote-tracking branch 'upstream/master'
196121b [Mubarak Seyed] Merge remote-tracking branch 'upstream/master'
491a1eb [Mubarak Seyed] Removing streaming visibility from getRDDCreationCallSite in DStream
33a7295 [Mubarak Seyed] Fixing review comments: Merging both setCallSite methods
c26d933 [Mubarak Seyed] Merge remote-tracking branch 'upstream/master'
f51fd9f [Mubarak Seyed] Fixing scalastyle, Regex for Utils.getCallSite, and changing method names in DStream
5051c58 [Mubarak Seyed] Getting return value of compute() into variable and call setCallSite(prevCallSite) only once. Adding return for other code paths (for None)
a207eb7 [Mubarak Seyed] Fixing code review comments
ccde038 [Mubarak Seyed] Removing Utils import from MappedDStream
2a09ad6 [Mubarak Seyed] Changes in Utils.scala for SPARK-1853
1d90cc3 [Mubarak Seyed] Changes for SPARK-1853
5f3105a [Mubarak Seyed] Merge remote-tracking branch 'upstream/master'
70f494f [Mubarak Seyed] Changes for SPARK-1853
1500deb [Mubarak Seyed] Changes in Spark Streaming UI
9d38d3c [Mubarak Seyed] [SPARK-1853] Show Streaming application code context (file, line number) in Spark Stages UI
d466d75 [Mubarak Seyed] Changes for spark streaming UI