promoterE2eRegistry: registry-sandbox.k8s.io/e2e-test-images
buildImageRegistry: registry-sandbox.k8s.io/build-image
gcEtcdRegistry: registry-sandbox.k8s.io
gcRegistry: registry-sandbox.k8s.io
sigStorageRegistry: registry-sandbox.k8s.io/sig-storage
cloudProviderGcpRegistry: registry-sandbox.k8s.io/cloud-provider-gcp

Add custom registries for e2e tests.
Add custom registries for e2e tests.

Make registry-sandbox.k8s.io the default registry for some e2e tests.
Signed-off-by: Arnaud Meukam <96190fcd0798f0afa72279990e31ddc33e4f2ea2@gmail.com>
