Fix virsh error message when -d arg is not numeric
Fix virsh error message when -d arg is not numeric

novel/fbsd-libvirt,cbosdo/libvirt,wiedi/libvirt,warewolf/libvirt,jeckersb/libvirt,elmarco/libvirt,andreabolognani/libvirt,rlaager/libvirt,dumbbell/libvirt,agx/libvirt,crobinso/libvirt,rlaager/libvirt,fabianfreyer/libvirt,kantai/libvirt-vfork,rmarwaha/libvirt1,zippy2/libvirt,dumbbell/libvirt,rmarwaha/libvirt1,rmarwaha/libvirt1,emaste/libvirt,cbosdo/libvirt,warewolf/libvirt,agx/libvirt,kantai/libvirt-vfork,shugaoye/libvirt,iam-TJ/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,wiedi/libvirt,leilihh/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,amery/libvirt-vserver,novel/fbsd-libvirt,crobinso/libvirt,foomango/libvirt,trainstack/libvirt,VenkatDatta/libvirt,soulxu/libvirt-xuhj,fabianfreyer/libvirt,jardasgit/libvirt,wiedi/libvirt,novel/fbsd-libvirt,amery/libvirt-vserver,rmarwaha/libvirt,leilihh/libvirt,nertpinx/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,trainstack/libvirt,dumbbell/libvirt,jardasgit/libvirt,iam-TJ/libvirt,rbu/libvirt,libvirt/libvirt,novel/fbsd-libvirt,rbu/libvirt,foomango/libvirt,usc-isi/libvirt,jfehlig/libvirt,danwent/libvirt-ovs,agx/libvirt,amery/libvirt-vserver,cbosdo/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,siboulet/libvirt-openvz,wiedi/libvirt,andreabolognani/libvirt,siboulet/libvirt-openvz,rmarwaha/libvirt1,soulxu/libvirt-xuhj,eskultety/libvirt,iam-TJ/libvirt,kantai/libvirt-vfork,kantai/libvirt-vfork,jeckersb/libvirt,iam-TJ/libvirt,datto/libvirt,novel/fbsd-libvirt,amery/libvirt-vserver,leilihh/libvirt,usc-isi/libvirt,nertpinx/libvirt,shugaoye/libvirt,jardasgit/libvirt,jeckersb/libvirt,agx/libvirt,olafhering/libvirt,VenkatDatta/libvirt,leilihh/libvirt,rbu/libvirt,eskultety/libvirt,iam-TJ/libvirt,soulxu/libvirt-xuhj,sshah-solarflare/Libvirt-PCI-passthrough-,zippy2/libvirt,wiedi/libvirt,novel/fbsd-libvirt,trainstack/libvirt,usc-isi/libvirt,warewolf/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,jardasgit/libvirt,rmarwaha/libvirt,rmarwaha/libvirt,olafhering/libvirt,bjzhang/libvirt,taget/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt,siboulet/libvirt-openvz,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,datto/libvirt,bjzhang/libvirt,emaste/libvirt,emaste/libvirt,rmarwaha/libvirt1,olafhering/libvirt,elmarco/libvirt,taget/libvirt,shugaoye/libvirt,zippy2/libvirt,warewolf/libvirt,crobinso/libvirt,jardasgit/libvirt,danwent/libvirt-ovs,datto/libvirt,danwent/libvirt-ovs,jeckersb/libvirt,usc-isi/libvirt,usc-isi/libvirt,warewolf/libvirt,siboulet/libvirt-openvz,libvirt/libvirt,cbosdo/libvirt,soulxu/libvirt-xuhj,eskultety/libvirt,emaste/libvirt,iam-TJ/libvirt,andreabolognani/libvirt,shugaoye/libvirt,dumbbell/libvirt,dumbbell/libvirt,bjzhang/libvirt,datto/libvirt,rlaager/libvirt,taget/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,libvirt/libvirt,agx/libvirt,eskultety/libvirt,zippy2/libvirt,leilihh/libvirt,nertpinx/libvirt,rbu/libvirt,kantai/libvirt-vfork,andreabolognani/libvirt,taget/libvirt,wiedi/libvirt,dumbbell/libvirt,zhlcindy/libvirt-1.1.4-maintain,sshah-solarflare/Libvirt-PCI-passthrough-,trainstack/libvirt,elmarco/libvirt,emaste/libvirt,warewolf/libvirt,siboulet/libvirt-openvz,wiedi/libvirt,shugaoye/libvirt,jeckersb/libvirt,trainstack/libvirt,crobinso/libvirt,olafhering/libvirt,warewolf/libvirt,trainstack/libvirt,bjzhang/libvirt,emaste/libvirt,trainstack/libvirt,soulxu/libvirt-xuhj,rmarwaha/libvirt1,elmarco/libvirt,libvirt/libvirt,rmarwaha/libvirt,datto/libvirt,cbosdo/libvirt,rlaager/libvirt,leilihh/libvirt,emaste/libvirt,amery/libvirt-vserver,novel/fbsd-libvirt,jfehlig/libvirt,jeckersb/libvirt,eskultety/libvirt,rbu/libvirt,nertpinx/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,jfehlig/libvirt,VenkatDatta/libvirt,foomango/libvirt,bjzhang/libvirt,elmarco/libvirt,foomango/libvirt,iam-TJ/libvirt,jeckersb/libvirt,danwent/libvirt-ovs,danwent/libvirt-ovs,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,rmarwaha/libvirt,novel/fbsd-libvirt,foomango/libvirt