We need to have the unit for ansible2's service to stop

It won't find the old init script and use it the way Ansible1's
service.py did.

playbooks/roles/mongo_2_6/tasks/main.yml

@@ -79,6 +79,27 @@
     - install
     - install:base
 
+- name: Add mongod systemd configuration on 16.04
+  template:
+    src:  "etc/systemd/system/mongod.service.j2"
+    dest: "/etc/systemd/system/mongod.service"
+  notify:
+    - restart mongo
+  when: ansible_distribution_release == 'xenial'
+  tags:
+    - install
+    - install:configuration
+
+- name: enable mongod systemd unit on 16.04
+  systemd:
+    name: mongod
+    enabled: yes
+    daemon_reload: yes
+  when: ansible_distribution_release == 'xenial'
+  tags:
+    - install
+    - install:configuration
+
 - name: Stop mongod service
   service:
     name: mongod
@@ -118,27 +139,6 @@
     - install
     - install:configuration
 
-- name: Add mongod systemd configuration on 16.04
-  template:
-    src:  "etc/systemd/system/mongod.service.j2"
-    dest: "/etc/systemd/system/mongod.service"
-  notify:
-    - restart mongo
-  when: ansible_distribution_release == 'xenial'
-  tags:
-    - install
-    - install:configuration
-
-- name: enable mongod systemd unit on 16.04
-  systemd_2_2:
-    name: mongod
-    enabled: yes
-    daemon_reload: yes
-  when: ansible_distribution_release == 'xenial'
-  tags:
-    - install
-    - install:configuration
-
 - name: Start mongo service
   service:
     name: mongod