[Ruby] Described of controller name out of Rails rule

Description

The wrong controller name will be described in routes.rb when made tags with snake case.
The controller name generated from the snake case tag is described in camel case into routes.rb.

In that case, Rails showed this error when I try to do db:create.

rails aborted!
ArgumentError: 'adminDesk' is not a supported controller name. This can lead to potential routing problems. See http://guides.rubyonrails.org/routing.html#specifying-a-controller-to-use

Swagger-codegen version

Unknown
I use swagger-hub.

Swagger declaration file content or url

tags:
- name: "client"
- name: "cloud_apps"
- name: "admin_desk"

add_swagger_route 'GET', '/admin/list', controller_name: 'adminDesk', action_name: 'admin_list_get'

Command line used for generation

N/A

Steps to reproduce

Just use tags with snake case.

Related issues/PRs

N/A

Suggest a fix/enhancement

N/A

Reproduce the issue with the provided snake_case tags and inspect the generated routes.rb entry for admin_desk. No source file or test is identified in the report; done means the generated controller name follows Rails naming rules and db:create no longer raises the unsupported-controller error.