function cloneVNodes (vnodes, createElement) {
  const clonedVNodes = vnodes.map(vnode => cloneVNode(vnode, createElement))
  return clonedVNodes
}
Clones an array of VNodes
@param {Array<Vue.VNode>} vnodes Array of VNodes to be cloned
@param {Function} createElement Render function
@returns {Array<Vue.VNode>} Cloned VNodes Array