Need to support formData parameters

[phil-scott-78]

see "updatePetWithForm"

           "post": {
                "tags": [
                    "pet"
                ],
                "summary": "Updates a pet in the store with form data",
                "description": "",
                "operationId": "updatePetWithForm",
                "consumes": [
                    "application/x-www-form-urlencoded"
                ],
                "produces": [
                    "application/json",
                    "application/xml"
                ],
                "parameters": [
                    {
                        "in": "path",
                        "name": "petId",
                        "description": "ID of pet that needs to be updated",
                        "required": true,
                        "type": "string"
                    },
                    {
                        "in": "formData",
                        "name": "name",
                        "description": "Updated name of the pet",
                        "required": true,
                        "type": "string"
                    },
                    {
                        "in": "formData",
                        "name": "status",
                        "description": "Updated status of the pet",
                        "required": true,
                        "type": "string"
                    }
                ],
                "responses": {
                    "405": {
                        "description": "Invalid input"
                    }
                },
                "security": [
                    {
                        "petstore_auth": [
                            "write:pets",
                            "read:pets"
                        ]
                    }
                ]
            },