util: refactor virCommandHook into virExec and virCommandHandshakeChild
util: refactor virCommandHook into virExec and virCommandHandshakeChild

taget/libvirt,taget/libvirt,VenkatDatta/libvirt,olafhering/libvirt,VenkatDatta/libvirt,rlaager/libvirt,iam-TJ/libvirt,shugaoye/libvirt,datto/libvirt,nertpinx/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,VenkatDatta/libvirt,fabianfreyer/libvirt,trainstack/libvirt,iam-TJ/libvirt,zippy2/libvirt,eskultety/libvirt,fabianfreyer/libvirt,taget/libvirt,iam-TJ/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,zippy2/libvirt,jardasgit/libvirt,elmarco/libvirt,shugaoye/libvirt,taget/libvirt,olafhering/libvirt,trainstack/libvirt,iam-TJ/libvirt,VenkatDatta/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,taget/libvirt,trainstack/libvirt,jardasgit/libvirt,zippy2/libvirt,libvirt/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,rlaager/libvirt,cbosdo/libvirt,agx/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,agx/libvirt,trainstack/libvirt,jfehlig/libvirt,shugaoye/libvirt,andreabolognani/libvirt,cbosdo/libvirt,datto/libvirt,nertpinx/libvirt,jardasgit/libvirt,iam-TJ/libvirt,fabianfreyer/libvirt,datto/libvirt,nertpinx/libvirt,crobinso/libvirt,agx/libvirt,eskultety/libvirt,rlaager/libvirt,eskultety/libvirt,libvirt/libvirt,libvirt/libvirt,siboulet/libvirt-openvz,rlaager/libvirt,crobinso/libvirt,jfehlig/libvirt,elmarco/libvirt,agx/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,olafhering/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,zippy2/libvirt,andreabolognani/libvirt,eskultety/libvirt,jfehlig/libvirt,elmarco/libvirt,shugaoye/libvirt,rlaager/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,cbosdo/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,jfehlig/libvirt,cbosdo/libvirt,libvirt/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,datto/libvirt,datto/libvirt,elmarco/libvirt,VenkatDatta/libvirt,trainstack/libvirt,agx/libvirt,siboulet/libvirt-openvz,andreabolognani/libvirt,jardasgit/libvirt,eskultety/libvirt,trainstack/libvirt,fabianfreyer/libvirt