[JAVA] Generating allOf model does not use typeMappings

Description

I would like to map existing type of generated code to another type (as a workaround for #10029 ) by typeMapping. It work partially: the name of class has been changed but the inheritance types have not and it causes compilation error.

Swagger-codegen version

2.4.15

Swagger declaration file content or url

swagger: '2.0'
info:
  title: Swagger Petstore
  description: Generating allOf model does not use typeMappings
  version: 1.0.0
paths:
  /pet/:
    get:
      responses:
        200:
          description: successful operation
          schema:
            $ref: '#/definitions/Pet'
  /pet-summary/:
    get:
      responses:
        200:
          description: successful operation
          schema:
            $ref: '#/definitions/Pet-Summary'
definitions:
  Pet:
    allOf:
      - $ref: '#/definitions/Pet-Summary'
    type: object
    properties:
      eye-color:
        type: string
        example: hazel
  Pet-Summary:
    type: object
    properties:
      name:
        type: string
        example: doggie

task generateServerStub {
	doLast {
		def config = new CodegenConfigurator()
		config.setInputSpec(sourceFile)
		config.setOutputDir("$projectDir")
		config.setLang('spring')
		config.setAdditionalProperties([
				'interfaceOnly': 'true',
				'useOptional'  : 'true',
				'apiPackage'   : 'com.test.api',
				'modelPackage' : 'com.test.model',
				'dateLibrary'  : 'java8',
				'sourceFolder' : swaggerOutputDir,
				'useTags'      : 'true'
		])
		config.setTypeMappings(['PetSummary': 'AnotherPetSummary'])
		new DefaultGenerator().opts(config.toClientOptInput()).generate()
	}

Command line used for generation

gradlew generateServerStub

Steps to reproduce

1. Create your this groovy task
2. Create api.yml in src/main/resources in a project directory
3. Run gradlew generateServerStub

Related issues/PRs

Suggest a fix/enhancement

Start with CodegenConfigurator type mappings and the DefaultGenerator path used by the Spring generator for allOf models. Reproduce the issue with the supplied Swagger declaration and Gradle task, then verify that the mapped PetSummary type is also used for generated inheritance and that the generated Java code compiles.