Test: Add a testcase for PowerPC compat mode cpu specification.

This introduces a testcase for PowerPC compat mode cpu specification.
Signed-off-by: NPrerna Saxena <prerna@linux.vnet.ibm.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/qemuxml2argv-pseries-cpu-compat.args

+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test \
+QEMU_AUDIO_DRV=none /usr/bin/qemu-system-ppc64 -S -M pseries \
+-cpu host,compat=power7 \
+-m 214 -smp 4 -nographic -nodefconfig -nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -usb \
+-chardev pty,id=charserial0 \
+-device spapr-vty,chardev=charserial0,reg=0x30000000

tests/qemuxml2argvdata/qemuxml2argv-pseries-cpu-compat.xml

+<domain type='kvm'>
+  <name>QEMUGuest1</name>
+  <memory unit='KiB'>219100</memory>
+  <currentMemory unit='KiB'>219100</currentMemory>
+  <vcpu placement='static'>4</vcpu>
+  <os>
+    <type arch='ppc64' machine='pseries'>hvm</type>
+  </os>
+  <cpu mode='host-model'>
+    <model>power7</model>
+  </cpu>
+  <clock offset='utc'/>
+  <devices>
+      <emulator>/usr/bin/qemu-system-ppc64</emulator>
+      <console type='pty'>
+        <address type="spapr-vio"/>
+      </console>
+      <memballoon model="none"/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1310,6 +1310,8 @@ mymain(void)
             QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("pseries-cpu-exact", QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE,
             QEMU_CAPS_NODEFCONFIG);
+    DO_TEST("pseries-cpu-compat", QEMU_CAPS_KVM, QEMU_CAPS_CPU_HOST,
+            QEMU_CAPS_CHARDEV, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG);
     DO_TEST("disk-ide-drive-split",
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_NODEFCONFIG,
             QEMU_CAPS_IDE_CD);