Every caller of ReadOrDie() specified ginkgo.Fail as fail argument,
and that was intentional to avoid depending on Ginkgo.
However that just spreaded the dependency on Ginkgo to caller sides.
Especially that was unnecessary e2e test framework "ingress" depended
on Ginkgo only for the above reason.
Now we are cleaning up the dependencies on e2e tests, so let's just
remove such dependencies.