Ensure binary is resolved wrt $PATH in virExec
Ensure binary is resolved wrt $PATH in virExec

virExec would only resolved the binary to $PATH if no env
variables were being set. Since there is no execvep() API
in POSIX, we use virFindFileInPath to manually resolve
the binary and then use execv() instead of execvp().

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