xen bug fix update

Updated xen packages that add support for the HLT instruction emulation and the
assignment of the Intel 82599 Virtual Function to the Hardware Virtual Machine
(HVM) guest.

Xen is a high performance and secure open source virtualization framework.
Virtualization allows users to run guest operating systems in virtual machines
on top of a host operating system.

These updated xen packages fix the following bugs:

* due to the missing HLT (halt) instruction emulation in the VMXAssist real-mode
emulator, certain versions of the SYSLINUX boot loader could have caused the
guest operating system (domU) to stop responding. With this update, the HLT
instruction emulation has been added, and all versions of SYSLINUX now boot
properly. (BZ#593230)

* previously, the PCIe Capability Structure was set to 0. As a result, it was
impossible to assign the Niantic Virtual Function (VF) to the Hardware Virtual
Machine (HVM) guest. This has been fixed, and the Niantic VF can now be assigned
as expected. (BZ#599018)

All Xen users should install this update, which addresses these issues.

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

593230 - Add HLT instruction emulation to VMXAssist in Xen
599018 - ixgbe VFs cannot be assigned to HVM guest