Add gnocchi-dbsync command

Additionally, add unified CLI commands services preparation
to be used by gnocchi-api and gnocchi-dbsync.

Change-Id: I534f6221a2e9c6810053be4872acad15cc69d551

gnocchi/cli.py

@@ -0,0 +1,31 @@
+# Copyright (c) 2013 Mirantis Inc.
+#
+# 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 oslo.config import cfg
+
+from gnocchi.indexer import sqlalchemy as sql_db
+from gnocchi.rest import app
+from gnocchi import service
+
+
+def storage_dbsync():
+    service.prepare_service()
+    indexer = sql_db.SQLAlchemyIndexer(cfg.CONF)
+    indexer.upgrade()
+
+
+def api():
+    service.prepare_service()
+    app.build_server()