Show the info of one tier

This api offers the interface to show the detailed info of one tier.
The info of one tier will be returned.
---
tags:
  - Tiers
parameters:
  - name: tier_name
    description: tier name
    in: path
    type: string
    required: true
definitions:
  Tiers:
    type: object
    properties:
      creds_name:
          $ref: '#/definitions/Name'
  Name:
    type: string
responses:
  200:
    description: Show the detailed info of one tier
    schema:
      $ref: '#/definitions/Tiers'
    examples:
        "tier": ""
        "ci_loop": ""
        "description": ""
        "order":
        "testcases": []