[Other] Adapt C&H test cluster to Kubernetes Node Distribution and Availability (scs-0214)

[anjastrunk]

Adapt C&H test cluster to Kubernetes Node Distribution and Availability (scs-0214) and evaluate its costs.

Todos:

• Adapt C&H test cluster to SCS standard
• Update standard documentation with costs/cost estimation
• Write how to and/or adaption script

[cah-hbaum]

Had some initial problems with the k8s cluster, since the values required by the test aren't by yaook/k8s probably due to the fact, that the k8s cluster isn't directly created through Openstack, but instead by an "external" tool.
After patching the nodes with the respective labels (the values were already available, just not under the expected names, I got the following test output):

WARNING: There seems to be no distribution across multiple regions or labels aren't set correctly across nodes.
INFO: The nodes are distributed across 3 zones.
WARNING: There seems to be no distribution across multiple regions or labels aren't set correctly across nodes.
INFO: The nodes are distributed across 3 zones.

[cah-hbaum]

Updated the branch used for this with the informational content about the Kubernetes standards, which can be found here.