[SPARK-10706] [MLLIB] Add java wrapper for random vector rdd

[rotationsymmetry]

Add java wrapper for random vector rdd

@holdenk @srowen

[SparkQA]

Test build #42721 has finished for PR 8841 at commit 59a856f.

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

[holdenk]

This LGTM, @srowen can hopefully take a look too.

[srowen]

LGTM

[srowen]

Sorry @rotationsymmetry, some conflicts now -- can you rebase and force push?

[SparkQA]

Test build #42780 has finished for PR 8841 at commit 9258225.

• This patch fails MiMa tests.
• This patch merges cleanly.
• This patch adds the following public classes (experimental):
  • class CountVectorizer(JavaEstimator, HasInputCol, HasOutputCol):
  • class CountVectorizerModel(JavaModel):
  • case class Sort(

[SparkQA]

Test build #42795 has finished for PR 8841 at commit f669b6e.

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

[rotationsymmetry]

@srowen I have rebased and pushed the PR. Thanks!

cc @holdenk