qemu no longer loads kvm_* module on older kernels (12.04)

Note: This bug affects the precise-havana Ubuntu Cloud Archive pocket only.

In saucy (and Havana UCA), changes were introduced to the qemu package that modified how the CPU-specific kvm-intel/kvm-amd get loaded at package installation time. Where it was previously modprobe'd from a maintainer script, it now relies on entirely on udev and modalias magic to automatically load the correct kvm-* module for the current CPU at boot.

This works fine in Saucy, however this all depends on 3.5+ kernels. When using the UCA on precise with the default 3.2, we end up needing to manually load the kvm_intel module before nova-compute-kvm+libvirt can do anything useful.

Short of back-porting a newer kernel to UCA, it was proposed that we carry a small delta in the qemu package that reinstates the previous module loading.