Revert k8s.gcr.io vanity domain

This reverts commit eba5b6092a.

Fixes https://github.com/kubernetes/kubernetes/issues/57526

test/integration/framework/util.go

@@ -40,7 +40,7 @@ import (
 const (
 	// When these values are updated, also update cmd/kubelet/app/options/options.go
 	// A copy of these values exist in e2e/framework/util.go.
-	currentPodInfraContainerImageName    = "k8s.gcr.io/pause"
+	currentPodInfraContainerImageName    = "gcr.io/google_containers/pause"
 	currentPodInfraContainerImageVersion = "3.0"
 )