[CORD-2497] add playbook to start cassandra db from hss_db service

Change-Id: I8435d46753ce27bafec4f5fcd6c1bb885218bdec
diff --git a/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml b/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml
index 35148b5..e57b6b9 100644
--- a/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml
+++ b/xos/synchronizer/steps/hssdbserviceinstance_playbook.yaml
@@ -12,12 +12,16 @@
 # 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:
+  remote_user: ubuntu
+  become: yes
+  become_user: root
+  become_method: sudo
   vars:
+    - config_file_path: /etc/cassandra
+    - db_ip: {{ db_ip }}
+  roles:
+    - setup_cassandra_db