Remove nova_cert option

The nova-cert service was removed from nova during Pike cycle[1] and is
no longer available since 16.0.0 release. Because Pike and older
releases are no longer supported, the option can be removed now.

[1] https://review.opendev.org/c/openstack/nova/+/459460

Change-Id: If520dc802bced4acfddd75a05a31dd83bc8c6354

releasenotes/notes/remove-nova_cert-e2ee70a40e117e8a.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    The deprecated ``[compute-feature-enabled] nova_cert`` option has been
+    removed. The nova-cert service was removed from nova in 16.0.0 release.
+    Tests of compute root certificates API have also been removed.

tempest/api/compute/certificates/test_certificates.py

@@ -1,40 +0,0 @@
-# Copyright 2012 OpenStack Foundation
-# 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.
-
-from tempest.api.compute import base
-from tempest import config
-from tempest.lib import decorators
-
-CONF = config.CONF
-
-
-class CertificatesV2TestJSON(base.BaseV2ComputeTest):
-    """Test Certificates API"""
-
-    @classmethod
-    def skip_checks(cls):
-        super(CertificatesV2TestJSON, cls).skip_checks()
-        if not CONF.compute_feature_enabled.nova_cert:
-            raise cls.skipException("Nova cert is not available")
-
-    @decorators.idempotent_id('c070a441-b08e-447e-a733-905909535b1b')
-    def test_create_root_certificate(self):
-        """Test creating root certificate"""
-        self.certificates_client.create_certificate()
-
-    @decorators.idempotent_id('3ac273d0-92d2-4632-bdfc-afbc21d4606c')
-    def test_get_root_certificate(self):
-        """Test getting root certificate details"""
-        self.certificates_client.show_certificate('root')

tempest/config.py

@@ -563,13 +563,6 @@ ComputeFeaturesGroup = [
                 default=True,
                 help='Does the test environment support creating snapshot '
                      'images of running instances?'),
-    cfg.BoolOpt('nova_cert',
-                default=False,
-                help='Does the test environment have the nova cert running?',
-                deprecated_for_removal=True,
-                deprecated_reason="On Nova side, the nova-cert service is "
-                                  "deprecated and the service will be removed "
-                                  "as early as Ocata."),
     cfg.BoolOpt('personality',
                 default=False,
                 help='Does the test environment support server personality'),