mustache file for swagger ui configuration uses deprecated class/methods

Description

When I use spring 5 and use swagger-codegen/modules/swagger-codegen/src/main/resources/JavaSpring/libraries/spring-mvc/swaggerUiConfiguration.mustache
as a template the generated class contains deprecated code.
Also if the json that is created by the API contains new lines etc, the pretty printer that is attached in this configuration might produce bad results (escaped quotes and new lines will appear when using curl/postman).
I think that the example should be up to date or at least you should have one that is compativle with spring 5.

This example is still not updated in head's version.

we are using swagger codegen 2.3.1 with spring 5.0.3.
When using the template (codegen/src/main/resources/JavaSpring/libraries/spring-mvc/swaggerUiConfiguration.mustache) almost as is, returning an already formatted json will produce results which include \r\n and escaped quotes (") as part of the result.

updaing the code to match the new interface in spring 5 and not setting the default mapper caused the json to return as expected via curl/postman.

Start with swagger-codegen/modules/swagger-codegen/src/main/resources/JavaSpring/libraries/spring-mvc/swaggerUiConfiguration.mustache and compare its configuration with the Spring 5 interface. Check the generated class using an already formatted JSON response through curl or Postman. Done means deprecated code is updated and formatted JSON no longer includes escaped quotes or line breaks.