kvm: Present the UUID of the VM as serial through smbios information (apache#9236)

This PR makes sure a KVM VM gets the UUID of the VM as a static serialnumber through smbios.

Some applications on primarily Windows servers require a stable serial number for licensing purposes. By providing this serial number we can make sure these applications can have a license configured.

More information: https://libvirt.org/formatdomain.html#smbios-system-information

Author: wido

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java

@@ -237,6 +237,7 @@ public String toString() {
                 guestDef.append("<entry name='manufacturer'>" + getManufacturer() +"</entry>\n");
                 guestDef.append("<entry name='product'>" + getProduct() + "</entry>\n");
                 guestDef.append("<entry name='uuid'>" + _uuid + "</entry>\n");
+                guestDef.append("<entry name='serial'>" + _uuid + "</entry>\n");
                 guestDef.append("</system>\n");
                 guestDef.append("</sysinfo>\n");