Prometheus fixes

* Rename 'replica' to 'replicas' in docker/swarm/service/monitoring
* Add 'discovery_domain' environment for entrypoint
* Build prometheus/server/target/etcd.yml yourself
* Build prometheus/server/target/kubernetes.ym yourself
* Add prometheus/server/target/dns.yml
* Fix SSL permissions for prometheus

Change-Id: Icae085f6b0762ada58d03cde276963ec1e4bdefa
7 files changed