Cannot run testsuite if an application holds port 8080 open

We run jobs on a Jenkins cluster where the master is also a slave. The master runs the web front end gui on port 8080. The default wildfly web profile uses the same port. I tried starting undertow on a different port but the testsuite has some hardcoded references to port 8080, for example:

testsuite/integration/src/test/xslt/changeIPAddresses.xsl
testsuite/integration/xts/src/test/java/org/jboss/as/test/xts/wsat/client/ATClient.java
testsuite/integration/xts/src/test/java/org/jboss/as/test/xts/wsba/coordinatorcompletion/client/BACoordinatorCompletionClient.java
testsuite/integration/xts/src/test/java/org/jboss/as/test/xts/wsba/participantcompletion/client/BAParticipantCompletionClient.java

The particular command I tried was:

./tools/maven/bin/mvn -s tools/maven/conf/settings.xml test   '-f' './testsuite/integration/xts/pom.xml' '-Pxts.integration.tests.profile' -Djboss.http.port=xxx