stable tag on kvm patches

To have better testing over -stable kernel KVM Avi decided to drop the Cc: [email protected] tag (which meant such patches are included directly in the process by Greg), to instead queue patches in kvm-updates/2.6.3x branches and autotest them before submission.

So to avoid automatic inclusion, a new tag for stable patches is proposed: KVM-Stable-Tag. Please use that instead of "Cc:
[email protected]".

BTW, this could also be useful to help the cherry-picking process for qemu/qemu-kvm stable branches.