Commits d7434ae8 and 9c4afbda added replies files for
QEMU 3.0.0 on s390x and QEMU 3.1.0 on x86_64 respectively, but
only enabled the corresponding test in qemucapabilities and not
in qemucaps2xml.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>