Remove Nova v3 version API schema

The commit Ia8e03aad49c524e5c3df110f0737eee3262b93e6 added a response
schema for Nova v3 version API. However the v3 API has been removed
but we forgot to remove it.
This patch removes it for the cleanup before adding the response
schema of Nova v2/v2.1 version API.

Change-Id: I5e96630fe9d4ae424df7064f4f759497c634f02c

tempest/api_schema/response/compute/v2_1/version.py

@@ -1,59 +0,0 @@
-# Copyright 2014 NEC Corporation.  All rights reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-version = {
-    'status_code': [200],
-    'response_body': {
-        'type': 'object',
-        'properties': {
-            'version': {
-                'type': 'object',
-                'properties': {
-                    'id': {'type': 'string'},
-                    'links': {
-                        'type': 'array',
-                        'items': {
-                            'type': 'object',
-                            'properties': {
-                                'href': {'type': 'string', 'format': 'uri'},
-                                'rel': {'type': 'string'},
-                                'type': {'type': 'string'}
-                            },
-                            'required': ['href', 'rel']
-                        }
-                    },
-                    'media-types': {
-                        'type': 'array',
-                        'items': {
-                            'type': 'object',
-                            'properties': {
-                                'base': {'type': 'string'},
-                                'type': {'type': 'string'}
-                            },
-                            'required': ['base', 'type']
-                        }
-                    },
-                    'status': {'type': 'string'},
-                    'updated': {'type': 'string', 'format': 'date-time'},
-                    'version': {'type': 'string'},
-                    'min_version': {'type': 'string'}
-                },
-                # NOTE: version and min_version have been added since Kilo,
-                # so they should not be required.
-                'required': ['id', 'links', 'media-types', 'status', 'updated']
-            }
-        },
-        'required': ['version']
-    }
-}