qemu: Prohibit reattaching node device if it is in use
qemu: Prohibit reattaching node device if it is in use

It doesn't make sense to reattach a device to host while it's
still in use, e.g, by a domain.

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