CA-111029: Switch to the C xenguest.
Merge commit '69cb32b81cbe94ab22cf917dab489f832e469f10'
Merge commit '1278c5c9f38f80fc3f8af1633c7df526eb28b873'
Merge commit '9c97c20ff839de6e704994ba4ac695b1f1936ed9'
Merge git://hg/carbon/trunk/xen-api