Sync kube-prometheus resources with 0.4.x upstream branch`

[UnderGreen]

Description

This PR is syncing our current setup of kube-prometheus with kube-prometheus release-0.4. For the time of applying this PR it was created from this commit. Release 0.4 was chosen based on kube-prometheus compatibility matrix with K8s 1.17.x.

Difference between upstream and our application:

1. Prometheus version is used 2.19.2 as requested in community slack.
2. Not all of the dashboards was added to our app, because I think they are useless for us.
3. gravity related rules was moved to gravity-rules.yaml.

Some important changes in this PR.

1. crds directory was renamed to kube-prometheus-setup because it contains more than just Custom Resource Definitions.
2. Nodes and Pods dashboards were converted to the new dashboards json specification(Grafana 5+).
3. Etcd related alerts/rules were deleted. I am going to add metrics right from etcd in another PR and delete them from satellite. Etcd 3 provides more metrics and they cover everything what we had to implement in satellite for etcd 2.

Type of change

• New feature (non-breaking change which adds functionality)

TODOs

• Perform manual testing for upgrades

Implementation

Testing done

1. Fully tested installation
2. kubectl top nodes/pods
3. Dashboards are shown and have no empty graphs/panels.

Additional information