tests: Add capabilities for QEMU 2.11.0 on s390x

Let us introduce the xml and reply files for QEMU 2.11.0 on s390x.
Signed-off-by: NShalini Chellathurai Saroja <shalini@linux.vnet.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.vnet.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>

tests/qemucapabilitiestest.c

@@ -188,6 +188,7 @@ mymain(void)
     DO_TEST("s390x", "caps_2.8.0");
     DO_TEST("s390x", "caps_2.9.0");
     DO_TEST("s390x", "caps_2.10.0");
+    DO_TEST("s390x", "caps_2.11.0");
 
     /*
      * Run "tests/qemucapsprobe /path/to/qemu/binary >foo.replies"