add libvirt xml config for linux with sd rootfs and bridge or nat networking

vexpress-a15/linux-3-10/linux-310-sd-bridgednet-libvirt.xml

+<domain type="kvm">
+  <name>linux310-sd</name>
+  <memory>131072</memory>
+  <currentMemory>131072</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch="armv7l" machine="vexpress-a15">hvm</type>
+    <kernel>/var/lib/libvirt/images/linux-3-10/zImage-sd</kernel>
+    <cmdline>console=ttyAMA0 mem=128M root=/dev/mmcblk0p1 rw rootfstype=ext3</cmdline>
+    <dtb>/var/lib/libvirt/images/linux-3-10/vexpress-v2p-ca15-tc1.dtb</dtb>
+  </os>
+  <clock offset="utc"/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>restart</on_crash>
+  <devices>
+       <emulator>/usr/bin/qemu-system-arm</emulator>
+     <disk type='file' device='disk'>
+     <driver name='qemu' type='qcow2'/> 
+     <source file='/var/lib/libvirt/images/linux-3-10/rootfs.qcow2' />
+     <target bus='sd' dev='sda'/>
+     </disk>
+     <serial type='pty'>
+       <target port='0'/>
+     </serial>
+     <console type='pty'>
+        <target type='serial' port='0'/>
+     </console>
+     <interface type='bridge'>
+     <source bridge='br0'/>
+     <model type='lan9118'/>
+     </interface>
+  </devices>
+
+</domain>

vexpress-a15/linux-3-10/linux-310-sd-libvirt.xml

+<domain type="kvm">
+  <name>linux310-sd</name>
+  <memory>131072</memory>
+  <currentMemory>131072</currentMemory>
+  <vcpu>1</vcpu>
+  <os>
+    <type arch="armv7l" machine="vexpress-a15">hvm</type>
+    <kernel>/var/lib/libvirt/images/linux-3-10/zImage-sd</kernel>
+    <cmdline>console=ttyAMA0 mem=128M root=/dev/mmcblk0p1 rw rootfstype=ext3</cmdline>
+    <dtb>/var/lib/libvirt/images/linux-3-10/vexpress-v2p-ca15-tc1.dtb</dtb>
+  </os>
+  <clock offset="utc"/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>restart</on_crash>
+  <devices>
+       <emulator>/usr/bin/qemu-system-arm</emulator>
+     <disk type='file' device='disk'>
+     <driver name='qemu' type='qcow2'/> 
+     <source file='/var/lib/libvirt/images/linux-3-10/rootfs.qcow2' />
+     <target bus='sd' dev='sda'/>
+     </disk>
+     <serial type='pty'>
+       <target port='0'/>
+     </serial>
+     <console type='pty'>
+        <target type='serial' port='0'/>
+     </console>
+	 <interface type='network'>
+       <source network='default'/>
+     </interface>
+  </devices>
+
+</domain>