NDEV-20011 : adding CIS GKE-1.6.0 benchmarks

cfg/gke-1.6.0/config.yaml

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+---
+## Version-specific settings that override the values in cfg/config.yaml

cfg/gke-1.6.0/controlplane.yaml

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+---
+controls:
+version: "gke-1.6.0"
+id: 2
+text: "Control Plane Configuration"
+type: "controlplane"
+groups:
+  - id: 2.1
+    text: "Authentication and Authorization"
+    checks:
+      - id: 2.1.1
+        text: "Client certificate authentication should not be used for users (Manual)"
+        type: "manual"
+        remediation: |
+          Alternative mechanisms provided by Kubernetes such as the use of OIDC should be
+          implemented in place of client certificates.
+          You can remediate the availability of client certificates in your GKE cluster. See
+          Recommendation 5.8.1.
+        scored: false
+
+  - id: 2.2
+    text: "Logging"
+    type: skip
+    checks:
+      - id: 2.2.1
+        text: "Ensure that a minimal audit policy is created (Manual)"
+        type: "manual"
+        remediation: "This control cannot be modified in GKE."
+        scored: false
+
+      - id: 2.2.2
+        text: "Ensure that the audit policy covers key security concerns (Manual)"
+        type: "manual"
+        remediation: "This control cannot be modified in GKE."
+        scored: false