qemu: snapshot: Reject revertion from clearly bad states
qemu: snapshot: Reject revertion from clearly bad states

Report errors on some states snapshots done by qemu should never reach

crobinso/libvirt,shugaoye/libvirt,crobinso/libvirt,andreabolognani/libvirt,jfehlig/libvirt,eskultety/libvirt,zippy2/libvirt,taget/libvirt,nertpinx/libvirt,andreabolognani/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,agx/libvirt,crobinso/libvirt,rlaager/libvirt,jardasgit/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,rlaager/libvirt,taget/libvirt,olafhering/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,rlaager/libvirt,agx/libvirt,VenkatDatta/libvirt,elmarco/libvirt,nertpinx/libvirt,agx/libvirt,elmarco/libvirt,datto/libvirt,shugaoye/libvirt,datto/libvirt,datto/libvirt,zippy2/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,andreabolognani/libvirt,olafhering/libvirt,fabianfreyer/libvirt,eskultety/libvirt,elmarco/libvirt,datto/libvirt,taget/libvirt,taget/libvirt,rlaager/libvirt,zippy2/libvirt,rlaager/libvirt,andreabolognani/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,libvirt/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,elmarco/libvirt,jfehlig/libvirt,libvirt/libvirt,eskultety/libvirt,shugaoye/libvirt,agx/libvirt,taget/libvirt,jardasgit/libvirt,agx/libvirt,fabianfreyer/libvirt,datto/libvirt,elmarco/libvirt,zippy2/libvirt,olafhering/libvirt,shugaoye/libvirt,nertpinx/libvirt,eskultety/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt