interface: reformat error logs
interface: reformat error logs

It was suggested during review of a different patch that the libvirt
interface driver API's should have "netcf:" in their log
messages. This patch eliminates that from all interface driver API
functions, and also eliminates the extra " - " in the case that netcf
returns no details in its error info (which *never* happens at
present, but could happen sometime in the future.

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