Add Nova patch file

This can be used to enable pxe booting in a Nova Kilo install.

patches/kilo/nova-pxe-boot.patch

@@ -0,0 +1,14 @@
+diff --git a/nova/virt/libvirt/driver.py b/nova/virt/libvirt/driver.py
+index 6097fbf..e419df6 100644
+--- a/nova/virt/libvirt/driver.py
++++ b/nova/virt/libvirt/driver.py
+@@ -4012,6 +4012,10 @@ class LibvirtDriver(driver.ComputeDriver):
+             self._conf_non_lxc_uml(virt_type, guest, root_device_name, rescue,
+                     instance, inst_path, image_meta, disk_info)
+ 
++        if (CONF.libvirt.virt_type in ['qemu', 'kvm'] and
++                instance.metadata.get('libvirt:pxe-first')):
++            guest.os_boot_dev = ['network'] + guest.os_boot_dev
++
+         self._set_features(guest, instance.os_type, caps, virt_type)
+         self._set_clock(guest, instance.os_type, image_meta, virt_type)