Claudiu Belu 3c8822133a tests: Simplifies image pulling tests ...

Melds the "pull image from gcr.io" and "pull image from docker hub" tests
into a single test that pulls the agnhost image from the configured
e2eRegistry.

This also removes the need to maintain and update the image
"gcr.io/kubernetes-e2e-test-images/windows-nanoserver:v1". It should have been
a manifest list that also includes future Windows releases, like Windows Server 1903.
Additionally, the image has ~300 MB, meaning that with this change, it won't have to
wait as much to spawn a pod.

Removes "should not be able to pull non-existing image from gcr.io", since
the test "should not be able to pull image from invalid registry" test already
exists, and both of them test the same effect: cannot spawn a pod with an
image that does not exist.

2019-10-06 04:41:38 -07:00

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