daemon: Fix various error reporting issues
daemon: Fix various error reporting issues

Many node device calls weren't properly relaying error messages, and
domain event registeration was not checking for error.

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