Fix pid leftover after converting ceph to kolla_docker

Related-Id: Icb1e81dc8acabe51740edc5658957022ddd13cd7
TrivialFix

Change-Id: Icf7cca554a972370bb109530cce3a0d451c95ae1

ansible/roles/ceph/tasks/start_osds.yml

@@ -36,7 +36,7 @@
       OSD_DEV: "{{ item.1['device'] }}"
     image: "{{ ceph_osd_image_full }}"
     name: "ceph_osd_{{ item.0.stdout }}"
-    pid: "host"
+    pid_mode: "host"
     privileged: True
     volumes:
       - "{{ node_config_directory }}/ceph-osd/:{{ container_config_directory }}/:ro"