[CORD-2516] Implement HSS-DB service and its synchronizer

Change-Id: I3b5185669bf8a4506d4d60b8bc858537f41c640a
diff --git a/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml b/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml
new file mode 100644
index 0000000..35148b5
--- /dev/null
+++ b/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml
@@ -0,0 +1,23 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+
+---
+- hosts: {{ instance_name }}
+  gather_facts: False
+  connection: ssh
+  user: ubuntu
+  sudo: yes
+  tasks:
+  vars:
+