k8s-cluster-checker v0.2

Changelog:

1. k8s-cluster-checker is now capable to creating reports in below formats:
   • csv: cluster.py give a combined report in excel format
   • json: json output can be used as input for other scripts
2. docker image has been updated to light weight version, moving away from alpine
3. Version check of k8s, docker and OS has been added.
4. CRD analysis has been added
5. This script has been tested and found to be working fine for k8s version > 1.14.x. Earlier versions may give unwanted results.