CompletionStageResponseTest is failing randomly on TravisC.
I've restarted a branch test 4 times today. Never do I get a clean run.
The configurations that fail appear to be random but it is always failing
on test CompletionStageResponseTest. Never do all the configs fail and different
combinations of configurations fail from run to run.

This test never fails on my local machine.

[ERROR] Tests run: 12, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 11.328 s <<< FAILURE! - in org.jboss.resteasy.test.response.CompletionStageResponseTest
[ERROR] testExceptionDelay(org.jboss.resteasy.test.response.CompletionStageResponseTest) Time elapsed: 1.543 s <<< FAILURE!
java.lang.AssertionError: expected:<200> but was:<500>