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
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Assignee

Jeremy Bowman

Reporter

Jeremy Bowman