[BUG][HTML] Vendor-specific media type breaks Example Data

[john3300]

Description

Using a vendor-specific media type causes the Example data section of the operation listing to be empty. Vendor-specific media types are fully supported by OpenAPI Spec 3.0 according to the 'Media Type Names' section on this page: https://swagger.io/docs/specification/media-types/

openapi-generator version

4.0.0-SNAPSHOT

OpenAPI declaration file content or url

openapi: 3.0.0
info:
  title: Test
  description: Test YAML
  version: '1.0'
servers:
  - url: http://localhost
paths:
  /employees/{id}:
    get:
      operationId: getEmployeeById
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: string
      responses:
        200:
          description: Success
          content:
            application/vnd.john3300+json;version=1.0:
              schema:
                $ref: '#/components/schemas/employee'
components:
  schemas:
    employee:
      type: object
      properties:
        name:
          type: string
      required:
        - name

Command line used for generation

java -jar openapi-generator-cli-4.0.0-20181217.102953-101.jar generate -g html -i test.yaml

Related issues/PRs

None that I've seen.

Suggest a fix

The code to generate these example sections needs to use a regex to be able to correctly parse these vendor-specific media types and also any additional parameters (e.g. `;version=1.0) that are present.

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