Ensures that requests that require large packets work properly, and that
they are not dropped.
Adds AgnhostPrivate to test/utils/image/manifest. Some tests are trying to pull
the agnhost image from the private registry, meaning that we would need to
always build and push the agnhost image to both e2e and private registry
whenever we bump its version. Decoupling them would mean that we only need
to push the image to the e2e registry.
