Previously, we've centralized several images into agnhost, including
test-webserver.
The Hybrid cluster network test was using the test-webserver image, and
was updated to use agnhost, but without properly making it so it behaves like
test-webserver, resulting in a failing test.
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:
- resource-consumer-controller
- test-webserver
