purge-docker-cluster: Remove ceph-osd service

The systemd ceph-osd@.service file used for starting the ceph osd
containers is used in all osd_scenarios.
Currently purging a containerized deployment using the lvm scenario
didn't remove the ceph-osd systemd service.
If the next deployment is a non-containerized deployment, the OSDs
won't be online because the file is still present and override the
one from the package.

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>

infrastructure-playbooks/purge-docker-cluster.yml

@@ -445,11 +445,6 @@
           state: absent
         with_items:
           - "{{ resolved_parent_device }}"
-
-      - name: remove ceph osd service
-        file:
-          path: /etc/systemd/system/ceph-osd@.service
-          state: absent
     when:
       - osd_scenario != "lvm"
 
@@ -484,6 +479,11 @@
     when:
       - osd_scenario == "lvm"
 
+  - name: remove ceph osd service
+    file:
+      path: /etc/systemd/system/ceph-osd@.service
+      state: absent
+
   - name: remove ceph osd image
     docker_image:
       state: absent