authmode must be at least api_and_config_map to disable admin bootstrap

Author: joshfrench

test/e2e/data/eks/cluster-template-eks-auth-bootstrap-disabled.yaml

@@ -31,6 +31,7 @@ spec:
   sshKeyName: "${AWS_SSH_KEY_NAME}"
   version: "${KUBERNETES_VERSION}"
   accessConfig:
+    authenticationMode: api_and_config_map
     bootstrapClusterCreatorAdminPermissions: false
   identityRef:
     kind: AWSClusterStaticIdentity