Provide basic integration tests for built-in AD trust installer
    
    A couple of tests were added to server/replica install integration
    suite to test AD trust install w/ various combinations of other optional
    components.
    
    https://fedorahosted.org/freeipa/ticket/6630
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>