Before 2.16, it allows following structure for files for `@LocalData`:
CopyArtifact/ is ignored since there's no CopyArtifactTest/config.xml.
Since 2.16, it doesn't ignore CopyArtifact/ and fail to use CopyArtifactTest.zip
This bug is introduced in this PR: https://github.com/jenkinsci/jenkins-test-harness/pull/36
This issue may make developers to upgrade jenkins-test-harness and plugin-pom.