macvtap: convert nl msg construction to use libnl
macvtap: convert nl msg construction to use libnl

In a first step I am converting the netlink message construction in
macvtap code to use libnl. It's pretty much a 1:1 conversion except that
now the message needs to be allocated and deallocated.

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