Discover Designate service

Add support to discover Designate service, so that we can set
service_available/designate automatically.

Change-Id: Ie4c092fc0b9d007b0ffdbf41d32d35679ed1b7f3

config_tempest/services/dns.py

@@ -0,0 +1,27 @@
+# Copyright 2019 Red Hat, Inc.
+# 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 config_tempest.services.base import Service
+
+
+class DnsService(Service):
+
+    @staticmethod
+    def get_service_name():
+        return ['designate']
+
+    @staticmethod
+    def get_codename():
+        return 'designate'

releasenotes/notes/discover-designate-service-238e4191c7251cd7.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    discover-tempest-config can now discover Designate service automatically,
+    and configures service_available/designate based on that discovery result
+    so that it can enable/disable tests for Designate based on deployment
+    status.