Added x-linode-cli-nested-list spec extension

This is used by the CLI for rendering nested lists into table rows,
repeating the values of other columns.

Author: Dorthu

README.md

@@ -49,3 +49,4 @@ Attribute | Location | Type | Supported By | Explanation
 `x-linode-ref-name`| keyword | string | [Linode Developer's Site](https://github.com/linode/developers) | Provides a mechanism by which the Developer's site can generate a dropdown menu with an Object's name when using the `oneOf` keyword with a `discriminator`. **Note**: This front end functionality is currently being developed.
 `x-linode-cli-rows`| media type | array | A list of JSON paths where the CLI can find the value it should treat as table rows.  Only needed for irregular endpoints.
 `x-linode-cli-use-schema` | media type | schema or $ref | The schema the CLI should use when showing a row for this response.  Use with `x-linode-cli-rows`.
+`x-linode-cli-nested-list` | media type | string | The name of the property defined by this response body's schema that is a nested list.  Items in the list will be broken out into rows in the CLI's output.

openapi.yaml

@@ -6268,6 +6268,18 @@ paths:
           description: Returns an array of all Pools in this Kubernetes cluster.
           content:
             application/json:
+              x-linode-cli-nested-list: linodes
+              x-linode-cli-use-schema:
+                type: object
+                properties:
+                  id:
+                    x-linode-cli-display: 1
+                  type:
+                    x-linode-cli-display: 2
+                  linodes.id:
+                    x-linode-cli-display: 3
+                  linodes.status:
+                    x-linode-cli-display: 4
               schema:
                 type: object
                 properties: