Correct test config file typo

improve error messages.

Remove odd spacing and line breaks from test config files

added saving results to PostgreSQL DB as a JSONB document

Update README for Kubernetes 1.8 support

Remove reference to specific benchmark version

We support multiple versions of the CIS benchmark

Add kubernetes 1.8 support

Dockerfile fix to copy all the cfg files

Client server error message on 1.6

This functionality is fulfilled by getKubeVersion.

Support multiple kubernetes version

Kubernetes versions.

The server version is used to load the correct benchmark check
to run against the Kubernetes cluster.