[BUG] Python Authentication path expecting auth token in oauth2 models

Bug Report Checklist

• [ ✅ ] Have you provided a full/minimal spec to reproduce the issue?
• [ ✅ ] Have you validated the input using an OpenAPI validator (example)?
• [ ✅ ] What's the version of OpenAPI Generator used? 3.3.4
• [ ✅ ] Have you search for related issues/PRs?
• [ ✅ ] What's the actual output vs expected output? Able to generate a token without needing a token

Description

Generated SDK seems to be requesting a token for a token generating call, only seems to be an issue with python

Example generated SDK

api_instance = API.AuthenticationApi(API.ApiClient(configuration))

openapi-generator version

3.3.4

OpenAPI declaration file content or url

Swagger 2.0 spec

securityDefinitions:
  OAuth2:
    type: oauth2
    flow: application
    tokenUrl: 'example.com'
    scopes:
      LOT_DEVICES_READ: LOT_DEVICES_READ
paths:
  /oauth/token:
      summary: Generate OAuth2 token
      tags:
        - Authentication
      operationId: auth token
      produces:
        - application/json
      consumes:
        - application/x-www-form-urlencoded
      parameters:
        - name: client_id
          in: formData
          required: true
          type: string
          description: ''
        - name: client_secret
          in: formData
          required: true
          type: string
          description: ''
        - name: grant_type
          in: formData
          required: true
          type: string
          default: client_credentials

Steps to reproduce

Generate SDK with the above

Related issues/PRs

Suggest a fix

Start with the Python generator's OAuth2 handling and the generated AuthenticationApi from the supplied Swagger 2.0 specification. Reproduce the token request and compare it with the authentication behavior of protected operations. Done means the token endpoint no longer requires an existing token while normal authenticated calls still work.