tests: new qemuxmlactive tests for s390x

tests: new qemuxmlactive tests for s390x

Add tests for active/inactive XML with deprecated_features attribute.

Note that for the qemuxmlactivetest, it is not possible to test an
inactive guest XML with the absence of "deprecated_features" attribute
and expect the active XML to have the attribute present.  This is due to
the fact that the tests never touch the code path in qemu_process that
trigger this change in the domain definition.

Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Collin Walling <walling@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>