Fix merging of -datasource.json files

The merge was missing a new line at the end of the merge, so only
the first datasource was being put into the ConfigMap.

In the generated version of this file at /contrib/kube-prometheus/manifests/grafana/grafana-deployment.yaml the version was bumped to 4.5.2 but seems it was overlooked in this templated version of the file.

kube-prometheus: various version updates

cut 0.13.0 & promote project to beta

This updates prometheus to 1.7.1 where it was missing

Feature/grafana configmap generator

Documentation Add doc to monitor a secure etcd cluster, typically set up via kube-aws

assets: modify and add grafana dashboards

Move to v1 from v1alpha1