qemu: Ignore unusable binaries
qemu: Ignore unusable binaries

When initializing qemu guest capabilities, we should ignore qemu
binaries that we are not able to extract version/help info from since
they will be unusable for creating domains anyway. Ignoring them is also
much better than letting initialization of qemu driver fail.

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