Promgen-k8s

IMPROVEMENTS:

- Add snapshot tests for generated YAML
- Allow specifying `prometheus.io/filterport: true` on pods to automatically discover all endpoints who's pod port name ends with `metrics` instead of using `prometheus.io/port`

IMPROVEMENTS:

- Allow specifying `prometheus.io/module` and `prometheus.io/path` annotations for blackbox service monitoring

IMPROVEMENTS:

- Remove some unneeded since duplicated labels from pods, nodes and cadvisor jobs
- Fix typo in name of the `ServiceEndpointsJob`
- Provide unique instance label for all jobs, usually copied from the `__address__` label
- Add `IngressesJob` for probing ingresses via the blackbox exporter (no HTTPS support)
- Allow setting the `scrape_interval` for nodes, cadvisor, services, service endpoints and ingresses jobs
- Support different scrape intervals for pods using `prometheus.io/interval` annotation
- Do not require proxies in remote clusters anymore for scraping pods, services, service endpoints or ingresses but blackbox-exporter might be needed instead

IMPROVEMENTS:

- Use cAdvisor metrics path compatible with Kubernetes 1.7.3 and above

IMPROVEMENTS:

- Do not use aliases in generated YAML

NEW FEATURES:

- Initial release