[SPARK-10963] [Streaming] [Kafka] make KafkaCluster public

[koeninger]

No description provided.

[SparkQA]

Test build #43315 has finished for PR 9007 at commit 2aa200b.

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

[srowen]

Looks OK to me.

[srowen]

@tdas are you OK with this one?

[tdas]

there are a number of classes that this exposes. I have to spend some time to think whether it is worth exposing all of that.

[srowen]

@tdas what do you think? just trying to get some resolution on this and I know you wanted to think.

[srowen]

@tdas do you mind if I merge this?

[yhilem]

For which spark version the merge of this pull request is planned?

[koeninger]

@tdas @srowen Can we either get this merged, or officially close off the possibility of merging it?

People are still raising specific issues on a fairly regular basis that would be solved in general by this PR (e.g. https://issues.apache.org/jira/browse/SPARK-13106), and it would be good to have clear expectations one way or the other.

[srowen]

@tdas I'd like to merge unless you object. I also find this a useful developer API.

[srowen]

Merged to master