Handling docker clean up during docker upgrade and docker config changes. (#3321)

* Added changes to clean up orphan containers and reload docker & kubelet directories.

* Added new files for cleaning up orphans and docker & kubelet directories

* Added new lines at the end of these files

* removed the trailing whitespaces from main.yml and clean-up.yml

* Updated as per the review comments

* Updated as per the review comments

* Removed service_facts and package_facts because they are not supported in ansible 2.4.0

* Corrected yaml syntax errors

* Removed the use of json_query filter and utilized selectattr

* Removed trailing spaces

* Changed the default value of docker_clean_up to false

* Added Changes to only include cleanup-docker-orphans.sh

* Reverted back changes done inside handler.

* Removed trailing spaces and made default value of docker_orphan_clean_up as true

* Reverted the default value of docker_orphan_clean_up as false

* Made the docker clean up as drop in

* Made the docker clean up as drop in

* Reverted the value of boolean docker_orphan_clean_up to false

roles/container-engine/docker/tasks/systemd.yml

@@ -38,4 +38,18 @@
   notify: restart docker
   when: dns_mode != 'none' and resolvconf_mode == 'docker_dns'
 
+- name: Copy docker orphan clean up script to the node
+  copy:
+    src: cleanup-docker-orphans.sh
+    dest: "{{ bin_dir }}/cleanup-docker-orphans.sh"
+    mode: 0755
+  when: docker_orphan_clean_up | bool
+
+- name: Write docker orphan clean up systemd drop-in
+  template:
+    src: docker-orphan-cleanup.conf.j2
+    dest: "/etc/systemd/system/docker.service.d/docker-orphan-cleanup.conf"
+  notify: restart docker
+  when: docker_orphan_clean_up | bool
+
 - meta: flush_handlers