xen bug fix update

Updated xen packages that resolve an issue are now available.

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 bug:

* the Linux bonding driver aggregates multiple network interfaces into a
single, local "bonded" interface. The 802.1Q specification (also known as
VLAN tagging) allows multiple bridged networks to transparently share a
single physical network link. When attempting to use a bonded interface and
802.1Q VLAN tagging together, the "network-bridge-bonding" networking
script incorrectly called the ifdown command on interfaces other than
"bond0", with the result that only the bond0 bridge became active (and not,
for example, the "bond0.5" bridge). With these updated packages, using
interface bonding together with 802.1Q VLAN tagging works as expected and
all interfaces that are expected to become active do so, thus resolving the
issue.

All users of the xen packages are advised to upgrade to these updated
packages, which resolve this issue.

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

This update is available via 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

502203 - network-bridge-bonding doesn't support 802.1q vlans