Update auto-deployed prometheus scrape config
We need to tweak the scrape config for the auto-deployed Prometheus server to address two things:
- cAdvisor metrics were moved in k8s 1.7, and we need to add an explicit scrape config item for them
- We need some custom relabeling to detect environments
We should use the config present in Omnibus as a basis, and strip out the GitLab server related items.
Edited by Joshua Lambert