Fix jenkins-job-dsl CI
Description
It looks like test runs started failing when Travis CI updated their default workers to Xenial and switched from the Oracle JVM to OpenJDK.
Example failure: https://travis-ci.org/edx/jenkins-job-dsl/builds/570887129
Example success: https://travis-ci.org/edx/jenkins-job-dsl/builds/562693178
This might be fixed easily via a Gradle upgrade or such.
Steps to Reproduce
None
Current Behavior
None
Expected Behavior
None
Reason for Variance
None
Release Notes
None
User Impact Summary
None
Done
Your pinned fields
Click on the next to a field label to start pinning.