Spring codegen handles incorrectly definition named "Resource"

Description

Codegen doesn't generate "Resource" model class. It uses org.springframework.core.io.Resource instead.

Swagger-codegen version

2.3.0

Swagger declaration file content or url

swagger: '2.0'
info:
  version: 1.0.0
  title: Simple API

paths:
  /resource:
    get:
      responses:
        200:
          description: search results matching criteria
          schema:
            $ref: '#/definitions/Resource'

definitions:
  Resource:
    type: object
    properties:
      id:
        type: string

Steps to reproduce

1. Save the definition to a file (e.g. C:\swagger.yaml).
2. Generate spring code using codegen v.2.3.0
   Sample command line:
   java -jar swagger-codegen-cli.jar generate -l spring -i C:\swagger.yaml -o C:\spring
3. Examine the generated ResourceApiController.java file.

Expected:
A "Resource" model class is generated and used in it.

Actual:
org.springframework.core.io.Resource class is used

Run the documented swagger-codegen-cli generate command with the supplied Swagger definition and inspect the generated ResourceApiController.java. Trace the Spring generator's model and import handling for the definition named Resource; done means a Resource model is generated and used instead of org.springframework.core.io.Resource.