_findHost() {
    let current = this;
    let app;

    // Keep iterating upward until we don't have a grandparent.
    // Has to do this grandparent check because at some point we hit the project.
    do {
      app = current.app || app;
    } while (current.parent.parent && (current = current.parent));

    return app;
  }
This method climbs up the hierarchy of addons
    up to the host application.

    This prevents previous addons (prior to `this.import`, ca 2.7.0)
    to break at importing assets when they are used nested in other addons.

    @private
    @method _findHost