Add option for adding imagePullSecrets for pulling from private registries and/or private proxy caches.
Also added a separate imageRegistry option for the redis image in the cart service db, since this image comes from Dockerhub instead of gcr. If you pull by a proxy cache, you often need to specify a different proxy cache.
Background
Add option for adding imagePullSecrets for pulling from private registries and/or private proxy caches. Also added a separate imageRegistry option for the redis image in the cart service db, since this image comes from Dockerhub instead of gcr. If you pull by a proxy cache, you often need to specify a different proxy cache.