Use joda-time plugin for integration tests, not joda-time jar file

[MarkEWaite]

Use joda-time plugin for integration tests, not joda-time jar file

Since the joda-time plugin is now available with the current release of the joda-time jar, let's use it in the integration tests instead of using the jar file in the integration test.

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• Make sure you are requesting to pull a topic/feature/bugfix branch (right side) and not your master branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or in Jenkins JIRA
• Link to relevant pull requests, esp. upstream and downstream changes
• Did you provide a test-case? That demonstrates feature works or fixes the issue.

[MarkEWaite]

/label test

In case I'm allowed to assign labels to pull requests

[basil]

Not that it matters much, but everything else in this file is in <scope>test</scope>.