src/openvz: Utilize more of VIR_(APPEND|INSERT|DELETE)_ELEMENT
src/openvz: Utilize more of VIR_(APPEND|INSERT|DELETE)_ELEMENT

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

crobinso/libvirt,zippy2/libvirt,elmarco/libvirt,agx/libvirt,elmarco/libvirt,crobinso/libvirt,datto/libvirt,datto/libvirt,rlaager/libvirt,agx/libvirt,zippy2/libvirt,VenkatDatta/libvirt,olafhering/libvirt,nertpinx/libvirt,nertpinx/libvirt,andreabolognani/libvirt,taget/libvirt,eskultety/libvirt,olafhering/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,nertpinx/libvirt,datto/libvirt,taget/libvirt,agx/libvirt,libvirt/libvirt,VenkatDatta/libvirt,eskultety/libvirt,zippy2/libvirt,taget/libvirt,datto/libvirt,jardasgit/libvirt,agx/libvirt,nertpinx/libvirt,elmarco/libvirt,rlaager/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,crobinso/libvirt,libvirt/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,elmarco/libvirt,rlaager/libvirt,shugaoye/libvirt,elmarco/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,eskultety/libvirt,libvirt/libvirt,eskultety/libvirt,taget/libvirt,rlaager/libvirt,olafhering/libvirt,VenkatDatta/libvirt,datto/libvirt,zippy2/libvirt,taget/libvirt,andreabolognani/libvirt,rlaager/libvirt,jfehlig/libvirt,jfehlig/libvirt,shugaoye/libvirt,libvirt/libvirt,shugaoye/libvirt,olafhering/libvirt,fabianfreyer/libvirt,crobinso/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,jardasgit/libvirt,agx/libvirt,eskultety/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,andreabolognani/libvirt