test: Fake current pause-amd64 container for kubernetes tests

For some yet unknown reason kubernetes on our current (!) and rebuilt
Fedora images now wants the "k8s.gcr.io/pause-amd64:3.1" container image
instead of "gcr.io/google_containers/pause-amd64:3.0".

Fake this by tagging the old container accordingly, until this gets
fixed properly in docker-images.setup (but this requires rebuilding
*all* of our images, and some of them cannot be rebuilt now due to other
bugs).

See issue #9179

test/verify/check-kubernetes

@@ -37,6 +37,8 @@ class TestKubernetes(kubelib.KubernetesCase, kubelib.KubernetesCommonTests):
 
         m.upload(["verify/files/mock-k8s-tiny-app.json"], "/tmp")
         self.wait_api_server()
+        # HACK: https://github.com/cockpit-project/cockpit/issues/9179 ; fix this in docker-images.setup instead and rebuild images
+        m.execute("docker tag gcr.io/google_containers/pause-amd64:3.0 k8s.gcr.io/pause-amd64:3.1")
 
 @skipImage("No kubernetes packaged", "debian-stable", "debian-testing", "ubuntu-1604", "ubuntu-stable", "fedora-i386", "rhel-7", "rhel-7-5", "rhel-8", "centos-7")
 @skipImage("No cockpit-kubernetes packaged", "continuous-atomic", "fedora-atomic", "rhel-atomic")