[SPARK-5790][GraphX]: VertexRDD's won't zip properly for diff capability (added tests)

[brennonyork]

Added tests that @maropu created for vertices with differing partition counts. Wanted to make sure his work got captured /merged as its not in the master branch and I don't believe there's a PR out already for it.

[brennonyork]

/cc @maropu @ankurdave @srowen

[SparkQA]

Test build #28598 has started for PR 5023 at commit 83bbd29.

• This patch merges cleanly.

[srowen]

OK, is the idea that these are tests that pass, that should be included, or tests that fail and demonstrate a problem? Jenkins will tell us soon.

[SparkQA]

Test build #28598 has finished for PR 5023 at commit 83bbd29.

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

[AmplabJenkins]

Test PASSed.
Refer to this link for build results (access rights to CI server needed):
https://amplab.cs.berkeley.edu/jenkins//job/SparkPullRequestBuilder/28598/
Test PASSed.

[srowen]

OK to merge, since tests are good. Does this mean SPARK-5790 is essentially resolved by this? sounds like it was fixed separately, and this is about getting in additional tests created by the parallel effort to address this.

[brennonyork]

Sorry @srowen I should've been more clear, but yes you're correct. SPARK-5790 ended up duplicating most effort from SPARK-1955, PR #4705, but @maropu had created tests with his that I hadn't included. Wanted to make sure those were captured and, since SPARK-5790 wasn't closed, thought it best to include those here. Does that make sense? Sorry about the confusion!