WaitForEndpoint() of the endpoints e2e framework was used in
test/e2e/network/proxy.go only. In addition, the endpoints e2e
framework imported the core of e2e framework only for the function.
So this moves the function into test/e2e/network/proxy.go then we
can remove dependency of core framework from the sub e2e framework.
Quite a few images are only used a few times in a few tests. Thus,
the images are being centralized into the agnhost image, reducing
the number of images that have to be pulled and used.
This PR replaces the usage of the following images with agnhost:
- audit-proxy
- crd-conversion-webhook
- entrypoint-tester
- inclusterclient
- iperf
- porter
- serve-hostname
This is part of the transition to using framework/log instead
of the Logf inside the framework package. This will help with
import size/cycles when importing the framework or subpackages.
