## What changes were proposed in this pull request?
Bring the kafka-0-8 subproject up to date with some test modifications from development on 0-10.
Main changes are
- eliminating waits on concurrent queue in favor of an assert on received results,
- atomics instead of volatile (although this probably doesn't matter)
- increasing uniqueness of topic names
## How was this patch tested?
Unit tests
Author: cody koeninger <cody@koeninger.org>
Closes#14073 from koeninger/kafka-0-8-test-direct-cleanup.
## What changes were proposed in this pull request?
Testing for 0.10 uncovered an issue with a fixed port number being used in KafkaTestUtils. This is making a roughly equivalent fix for the 0.8 connector
## How was this patch tested?
Unit tests, manual tests
Author: cody koeninger <cody@koeninger.org>
Closes#14018 from koeninger/kafka-0-8-test-port.
## What changes were proposed in this pull request?
code cleanup in kafka-0-8 to match suggested changes for kafka-0-10 branch
## How was this patch tested?
unit tests
Author: cody koeninger <cody@koeninger.org>
Closes#13908 from koeninger/kafka-0-8-cleanup.
## What changes were proposed in this pull request?
`JavaKafkaStreamSuite.testKafkaStream` assumes when `sent.size == result.size`, the contents of `sent` and `result` should be same. However, that's not true. The content of `result` may not be the final content.
This PR modified the test to always retry the assertions even if the contents of `sent` and `result` are not same.
Here is the failure in Jenkins: http://spark-tests.appspot.com/tests/org.apache.spark.streaming.kafka.JavaKafkaStreamSuite/testKafkaStream
## How was this patch tested?
Jenkins unit tests.
Author: Shixiong Zhu <shixiong@databricks.com>
Closes#13281 from zsxwing/flaky-kafka-test.
## What changes were proposed in this pull request?
(See https://github.com/apache/spark/pull/12416 where most of this was already reviewed and committed; this is just the module structure and move part. This change does not move the annotations into test scope, which was the apparently problem last time.)
Rename `spark-test-tags` -> `spark-tags`; move common annotations like `Since` to `spark-tags`
## How was this patch tested?
Jenkins tests.
Author: Sean Owen <sowen@cloudera.com>
Closes#13074 from srowen/SPARK-15290.
## What changes were proposed in this pull request?
Renaming the streaming-kafka artifact to include kafka version, in anticipation of needing a different artifact for later kafka versions
## How was this patch tested?
Unit tests
Author: cody koeninger <cody@koeninger.org>
Closes#12946 from koeninger/SPARK-15085.
