Update xenopsd.0.9.29

Not merged yet because this breaks builds on xen-4.2 with libxl i.e. CentOS and Ubuntu. The latest version of xenopsd requires the libxl changes in xen-4.3. I think the only way forward is to jump to xen-4.3 everywhere, this would mean

* using the xen-4.3 .deb from debian experimental (which has the libxl fixes)
* acquiring a xen-4.3 SRPM from CentOS


Signed-off-by: David Scott <dave.scott@eu.citrix.com>