Tweak some settings for better Prometheus metrics access.
Tweak some settings for better Prometheus metrics access.

These are essentially the changes documented in https://github.com/coreos/prometheus-operator/blob/master/contrib/kube-prometheus/docs/kube-prometheus-on-kubeadm.md.

Signed-off-by: Matt Moyer <008a35542a21e53a065e010240fafe9ee9f69136@heptio.com>

heptio/aws-quickstart,heptio/aws-quickstart