nodeinfotest: Print libvirt error on failure
nodeinfotest: Print libvirt error on failure

If linuxNodeInfoCPUPopulate() fails, the test would just print "FAILED"
which is not very informative. It's better to print the real error.

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