Propose in this https://github.com/brancz/kubernetes-grafana/pull/78

* Avoid race condition when deploying quickstart example

The namespace and CRD creation must happen before any dependent objects
are created.  So we can put these in a separate directory (manifest/setup)
so they can be created before the other objects.

Some minor updates to the README and added a couple of scripts
for the quickstarts

Update travis script to avoid race condition

Signed-off-by: Paul Gier <pgier@redhat.com>

* simplify the example quickstart script and improve readme

Signed-off-by: Paul Gier <pgier@redhat.com>

* increase minikube memory to 6g for quickstart example

From the discussion brought up in this [issue](https://github.com/coreos/prometheus-operator/issues/2250), a new section has been added to the doc.

the operator spec key is named "externalUrl", rather than "externalURL"

Explicitly reference values we are interesting in (jsonnet style)
instead of just following conventions (helm style)

contrib/kube-prometheus: Add section on Prometheus Adapter requirements to README.md

Resolves issue #1629 in this repository.

replaced default namespaces rbac rules by a loop


set right variable name

In kubeadm 1.10 (and perhaps earlier versions, not sure), ctrl-mgr and scheduler pods' label key is `component=` rather than `k8s-app=`, which is the selector key used for kube-prometheus exporters for these components.

One of the `sed` commands for updating the kubeadm systemd
file (`/etc/systemd/system/kubelet.service.d/10-kubeadm.conf`)
was missing a `-i` reference to the file itself, causing it
to hang indefinitely if ran as declared.

I also wrapped this second `sed` in an `if grep ...` check,
in order to make the operation idempotent.