remove our config if docker start failed (#4260)

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

@@ -199,11 +199,26 @@
     mode: 0644
   when: not (ansible_os_family in ["CoreOS", "Container Linux by CoreOS", "ClearLinux", "RedHat", "Suse"] or is_atomic)
 
+- name: ensure docker started, remove our config if docker start failed and try again
+  block:
     - name: ensure service is started if docker packages are already present
       service:
         name: docker
         state: started
       when: docker_task_result is not changed
+  rescue:
+    - debug:
+        msg: "Docker start failed. Try to remove our config"
+    - name: remove kubespray generated config
+      file:
+        path: "{{ item }}"
+        state: absent
+      with_items:
+        - /etc/systemd/system/docker.service.d/http-proxy.conf
+        - /etc/systemd/system/docker.service.d/docker-options.conf
+        - /etc/systemd/system/docker.service.d/docker-dns.conf
+        - /etc/systemd/system/docker.service.d/docker-orphan-cleanup.conf
+      notify: restart docker
 
 - name: flush handlers so we can wait for docker to come up
   meta: flush_handlers