Rebase healthcheck to distroless
Rebase healthcheck to distroless

This is part of the effort described in kep kubernetes/enhancements#900
GoogleCloudPlatform/k8s-stackdriver,GoogleCloudPlatform/k8s-stackdriver,kawych/k8s-stackdriver,kawych/k8s-stackdriver,GoogleCloudPlatform/k8s-stackdriver,kawych/k8s-stackdriver,kawych/k8s-stackdriver