Make IntegrationTest fail if an error happened during uninstall
    
    Before this change, if the uninstall process fails, the test would not fail, due
    to the raiseonerr=False.
    
    It's necessary to remove the uninstall call in CALessBase because in
    TestIntegration there is another uninstall call. So, without the
    raiseonerr=False, it would make the uninstall process fail, since the master is
    already uninstalled.
    
    https://pagure.io/freeipa/issue/7357
    
    Reviewed-By: Christian Heimes <cheimes@redhat.com>