Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9263#issuecomment-171465728
By the way, aside from the `ser` issue this looks good to me.
For other reviewers: this change makes the test output much nicer in
Jenkins (and thus nicer on https://spark-tests.appspot.com):

One interesting thing: Jenkins seems to fail when trying to show
package-level test information for the PySpark tests:
https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/49329/testReport/pyspark.tests/.
I wonder whether this could be related to the presence of multiple XML reports
from concurrent PySpark test runs with different Python versions.
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