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

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

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