Discover Barbican service

Add support to discover Barbican service, so that we can set
service_available/barbican automatically.

Change-Id: I96800a95f844ce7675d266e456e01620e63e347a

config_tempest/services/key_manager.py

@@ -0,0 +1,27 @@
+# Copyright 2020 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 KeyManagerService(Service):
+
+    @staticmethod
+    def get_service_type():
+        return ['key-manager']
+
+    @staticmethod
+    def get_codename():
+        return 'barbican'

releasenotes/notes/discover-barbican-service-f211c170f58735e3.yaml

@@ -0,0 +1,8 @@
+---
+features:
+  - |
+   discover-tempest-config can now discover Barbican service automatically,
+   and configures service_available/barbican based on that discovery result
+   so that it can enable/disable tests for Barbican based on deployment
+   status.
+