This patch adds a readinessProbe to the quorum pods, this causes the
kubelet to test the etcd health endpoint, resulting in proper status of
the etcd node, and therefore keeping the quorum. This should help to
improve cluster stablility.

One can't hold this SLO, it heavily depends on the size of the
downloads.

Finally got around to fix the kubelet certificate situation. This patch
resolves the outstanding issue with having this flag around.

It turned out, that pushing all warning to GitLab resulted in being too
noisy. There were more than 30 issues opened in no time, often
duplicates, due to how GitLab maps or rather doesn't map alerts in the
free version.

This reverts commit de6e02d9.