* Add test for k8s version recency (#288)

* add initial test script
* check k8s release for releases
* check cluster with kubeconfig for version
* check version against each other
* if not matching, check for cadence time

Signed-off-by: Hannes Baum <hannes.baum@cloudandheat.com>

* Update test for k8s version recency (#288)

* updates to test after reviews from @chess-knight and @fdobrovolny
* changed math for weeks and months, since they were faulty in the previous implementation
* changed way how the k8s versions are compared to a simpler loop which also causes less problems

Signed-off-by: Hannes Baum <hannes.baum@cloudandheat.com>

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Signed-off-by: Hannes Baum <hannes.baum@cloudandheat.com>