Test for the new watchdog action inject-nmi

Adding a test for the new watchdog action "inject-nmi".
Signed-off-by: NBoris Fiuczynski <fiuczy@linux.vnet.ibm.com>

tests/qemuxml2argvdata/qemuxml2argv-watchdog-injectnmi.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \
+/usr/bin/qemu -S -M \
+pc -m 214 -smp 1 -nographic -monitor unix:/tmp/test-monitor,server,nowait \
+-no-acpi -boot c -usb -hda /dev/HostVG/QEMUGuest1 -net none -serial none -parallel \
+none -watchdog ib700 -watchdog-action inject-nmi

tests/qemuxml2argvdata/qemuxml2argv-watchdog-injectnmi.xml

+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </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='ide'/>
+      <address type='drive' controller='0' bus='0' unit='0'/>
+    </disk>
+    <controller type='ide' index='0'/>
+    <watchdog model='ib700' action='inject-nmi'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1185,6 +1185,7 @@ mymain(void)
     DO_TEST("watchdog", NONE);
     DO_TEST("watchdog-device", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("watchdog-dump", NONE);
+    DO_TEST("watchdog-injectnmi", NONE);
     DO_TEST("balloon-device", QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("balloon-device-auto",
             QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);