Deal with mixed-domain failures in the OpenJ9 jobs

The nightly CI jobs against OpenJ9 have 12 failures in the mixed-domain testsuite due to problems starting the embedded messaging broker on an EAP 7.0.0 Host.

https://ci.wildfly.org/viewLog.html?buildId=170906&tab=buildResultsDiv&buildTypeId=WF_MasterLinuxOpenJ98

I think this relates to https://issues.apache.org/jira/browse/ARTEMIS-444 and JBEAP-1887. The latter is resolved with a Fix Version of 7.0.2.CR1 but our mixed domain tests are not able to test against CPs.

So task here is to work around this somehow.