Disable parallel tests on Gradle again

Something is causing parallel tests to fail on CI. I haven't been able to track down what it is. The symptoms look similar to others where the cause was a test modifying the test-data directory.

The integration tests also sometimes run into OutOfMemoryErrors when I run them in parallel.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1887631 13f79535-47bb-0310-9956-ffa450edef68
1 file changed