AbstractSimpleApplicationClientTestCase pollutes the build/target/ installation

AbstractSimpleApplicationClientTestCase uses AppClientWrapper which ends up writing a log file in the WildFly installation in build/target. That's not ideal as that's not a test installation and its content shouldn't be polluted.

It's not critical as by the time the testsuite has run the build module has already created a zip of its installation, and that zip is what would get deployed if a release was being done.