Add Scoring Module implementation

This change is adding the main logic for the scoring module,
defines entry points for the scoring engine plugins and provides
a watcher-sync tool to enable Watcher database synchronization
without needing to restart any Watcher service.

Partially-Implements: blueprint scoring-module
Change-Id: If10daae969ec27a7008af5173359992e957dcd5e

watcher/cmd/sync.py

@@ -0,0 +1,39 @@
+# -*- encoding: utf-8 -*-
+#
+# Copyright (c) 2016 Intel
+#
+# Authors: Tomasz Kaczynski <tomasz.kaczynski@intel.com>
+#
+# 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.
+
+"""Script for the sync tool."""
+
+import sys
+
+from oslo_log import log as logging
+
+from watcher._i18n import _LI
+from watcher.common import service as service
+from watcher.decision_engine import sync
+
+LOG = logging.getLogger(__name__)
+
+
+def main():
+    LOG.info(_LI('Watcher sync started.'))
+
+    service.prepare_service(sys.argv)
+    syncer = sync.Syncer()
+    syncer.sync()
+
+    LOG.info(_LI('Watcher sync finished.'))