
Automatic merge from submit-queue (batch tested with PRs 38294, 37009, 36778, 38130, 37835) Only configure basic auth on gci if KUBE_USER and KUBE_PASSWORD are specified. This should not change the existing flow when KUBE_USER/KUBE_PASSWORD are specified. It makes not specifying those a valid option that means "don't turn on basic auth". I only did it for cluster/gce/gci for now, but others should be somewhat similar.
Container-VM Image
Container-VM Image is a container-optimized OS image for the Google Cloud Platform (GCP). It is primarily for running Google services on GCP. Unlike the open preview version of container-vm, the new Container-VM Image is based on the open source ChromiumOS project, allowing us greater control over the build management, security compliance, and customizations for GCP.