xen bug fix and enhancement update

Updated xen packages that fix several bugs and add enhancements are now
available.

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

This erratum includes the following bug fixes and enhancements:

- Rotate all log files periodically
- Fix overflow in qemu-img
- Fix race in DMA thread
- Fix blktap data access alignment
- Do not unpause domain after taking core
- Persist device model PID across restarts
- Pass internal libxc return value back to caller
- Fix passing of domid to libxc from python IOport & IRQ controllers
- Do not try to balloon more than physical RAM
- Add blktap sub-type checks
- Respect nographics request for HVM
- Put xenstored database on tmpfs
- Prefer grub.conf in pygrub
- Do not throw errors when listing domain
- Add mouse wheel support to PVFB

Users of Xen are advised to upgrade to these updated packages, which
include these bug fixes and enhancements.

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/FAQ_58_10188

234486 - pygrub tries to read menu.lst before grub.conf, tries to start non-existent kernel
238833 - Error: Device 0 not connected
249292 - qemu-dm segfaulting for fully-vritualized guest
253884 - xen tools - blktap outputs unaligned access error
337651 - network-bridge do not work with vlan interfaces
344861 - No ethernet controller driver on windows 2003 server of IA64 platform
422271 - Drop in support for logrotate
426861 - timer stops running after live migrate or dom0 reboot & save/restore of a Xen guest
429154 - bonding + arp monitoring + xen cause interface flapping
437086 - xen: buffer overflow detected: qcow-create terminated
440274 - Network-attach command mismatches the usage.
442077 - Using sdaa as a guest device results in corupted device name inside the guest
442698 - 'xm dump-core --crash' does not stop guest domain in time
444413 - Cannot use attach disk if subdriver option is wrong in blktap
445476 - Unable to create a PV guest with > 3 disks
446089 - xend / xenstored performance & scalability issues
456392 - Xen Support more than 16 disk devices (userland)
457199 - RHEL5.3 xen: include support for booting Fedora 10 DomU (i.e. bzImage support)
462702 - xenstored fails to start because selinux prevents access to files on tmpfs
462727 - Problems occur when executing 'xm reboot' on the second time.
473882 - [RHEL5.3]: xm block-detach no longer works