Test for the new watchdog model diag288

Adding a test for the new watchdog model diag288.
Signed-off-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>

tests/qemuxml2argvdata/qemuxml2argv-watchdog-diag288.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu -S -M \
+s390-virtio -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev \
+socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon \
+chardev=charmonitor,id=monitor,mode=readline -no-acpi \
+-drive file=/dev/HostVG/QEMUGuest1,if=none,id=drive-virtio-disk0 \
+-device virtio-blk-s390,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 \
+-device diag288,id=watchdog0 -watchdog-action inject-nmi

tests/qemuxml2argvdata/qemuxml2argv-watchdog-diag288.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory>219100</memory>
+  <currentMemory>219100</currentMemory>
+  <os>
+    <type arch='s390x' machine='s390-virtio'>hvm</type>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='virtio'/>
+      <boot order='1'/>
+    </disk>
+    <watchdog model='diag288' action='inject-nmi'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1186,6 +1186,9 @@ mymain(void)
     DO_TEST("watchdog-device", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("watchdog-dump", NONE);
     DO_TEST("watchdog-injectnmi", NONE);
+    DO_TEST("watchdog-diag288",
+            QEMU_CAPS_DEVICE, QEMU_CAPS_CHARDEV, QEMU_CAPS_NODEFCONFIG,
+            QEMU_CAPS_DRIVE, QEMU_CAPS_BOOTINDEX, QEMU_CAPS_VIRTIO_S390);
     DO_TEST("balloon-device", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("balloon-device-auto",
             QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);