qemu: Fix detection of failed migration
qemu: Fix detection of failed migration

When QEMU reported failed or canceled migration, we correctly detected
it but didn't really consider it as an error condition and migration
protocol just went on. Luckily, some of the subsequent steps eventually
failed end we reported an (unrelated and mostly random) error back to
the caller.

dumbbell/libvirt,emaste/libvirt,iam-TJ/libvirt,trainstack/libvirt,rmarwaha/libvirt1,eskultety/libvirt,jeckersb/libvirt,zippy2/libvirt,bjzhang/libvirt,iam-TJ/libvirt,jardasgit/libvirt,olafhering/libvirt,emaste/libvirt,warewolf/libvirt,iam-TJ/libvirt,shugaoye/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,olafhering/libvirt,fabianfreyer/libvirt,rmarwaha/libvirt1,novel/fbsd-libvirt,jfehlig/libvirt,iam-TJ/libvirt,emaste/libvirt,bjzhang/libvirt,novel/fbsd-libvirt,emaste/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,rmarwaha/libvirt,rlaager/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,andreabolognani/libvirt,jeckersb/libvirt,siboulet/libvirt-openvz,wiedi/libvirt,andreabolognani/libvirt,bjzhang/libvirt,warewolf/libvirt,novel/fbsd-libvirt,eskultety/libvirt,dumbbell/libvirt,rmarwaha/libvirt,emaste/libvirt,taget/libvirt,agx/libvirt,crobinso/libvirt,datto/libvirt,iam-TJ/libvirt,zippy2/libvirt,zhlcindy/libvirt-1.1.4-maintain,rmarwaha/libvirt,andreabolognani/libvirt,rmarwaha/libvirt1,nertpinx/libvirt,rmarwaha/libvirt1,rlaager/libvirt,elmarco/libvirt,rlaager/libvirt,cbosdo/libvirt,agx/libvirt,nertpinx/libvirt,datto/libvirt,siboulet/libvirt-openvz,VenkatDatta/libvirt,rlaager/libvirt,crobinso/libvirt,taget/libvirt,jfehlig/libvirt,warewolf/libvirt,warewolf/libvirt,jardasgit/libvirt,trainstack/libvirt,zippy2/libvirt,emaste/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,elmarco/libvirt,jeckersb/libvirt,trainstack/libvirt,wiedi/libvirt,cbosdo/libvirt,olafhering/libvirt,trainstack/libvirt,bjzhang/libvirt,novel/fbsd-libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,siboulet/libvirt-openvz,emaste/libvirt,novel/fbsd-libvirt,jeckersb/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,dumbbell/libvirt,zippy2/libvirt,VenkatDatta/libvirt,rmarwaha/libvirt,datto/libvirt,jfehlig/libvirt,libvirt/libvirt,crobinso/libvirt,warewolf/libvirt,novel/fbsd-libvirt,VenkatDatta/libvirt,agx/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,iam-TJ/libvirt,wiedi/libvirt,jeckersb/libvirt,warewolf/libvirt,taget/libvirt,elmarco/libvirt,shugaoye/libvirt,bjzhang/libvirt,eskultety/libvirt,andreabolognani/libvirt,shugaoye/libvirt,wiedi/libvirt,elmarco/libvirt,taget/libvirt,fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,cbosdo/libvirt,nertpinx/libvirt,jardasgit/libvirt,warewolf/libvirt,trainstack/libvirt,jeckersb/libvirt,wiedi/libvirt,rmarwaha/libvirt1,trainstack/libvirt,eskultety/libvirt,andreabolognani/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,olafhering/libvirt,libvirt/libvirt,wiedi/libvirt,dumbbell/libvirt,iam-TJ/libvirt,novel/fbsd-libvirt,nertpinx/libvirt,wiedi/libvirt,libvirt/libvirt,cbosdo/libvirt,jeckersb/libvirt,zhlcindy/libvirt-1.1.4-maintain,rmarwaha/libvirt1,datto/libvirt,fabianfreyer/libvirt,elmarco/libvirt,rmarwaha/libvirt,jardasgit/libvirt,trainstack/libvirt,dumbbell/libvirt,taget/libvirt,dumbbell/libvirt,shugaoye/libvirt,datto/libvirt,eskultety/libvirt,siboulet/libvirt-openvz