Improve docker test setups (#1161) (#1174)

* Improve readability.

* Move common code to new file.

(cherry picked from commit 167153bff5)

Co-authored-by: Felix Fontein <felix@fontein.de>

tests/integration/targets/setup_docker_registry/handlers/cleanup.yml

@@ -4,33 +4,40 @@
     name: "{{ item }}"
     state: absent
   with_items: "{{ docker_registry_setup_inames }}"
+
 - name: "Get registry logs"
   command: "docker logs {{ docker_registry_container_name_registry }}"
   register: registry_logs
   no_log: yes
   ignore_errors: yes
+
 - name: "Printing registry logs"
   debug:
     var: registry_logs.stdout_lines
   when: registry_logs is not failed
+
 - name: "Get nginx logs for first instance"
   command: "docker logs {{ docker_registry_container_name_nginx }}"
   register: nginx_logs
   no_log: yes
   ignore_errors: yes
+
 - name: "Get nginx logs for second instance"
   command: "docker logs {{ docker_registry_container_name_nginx2 }}"
   register: nginx2_logs
   no_log: yes
   ignore_errors: yes
+
 - name: "Printing nginx logs for first instance"
   debug:
     var: nginx_logs.stdout_lines
   when: nginx_logs is not failed
+
 - name: "Printing nginx logs for second instance"
   debug:
     var: nginx2_logs.stdout_lines
   when: nginx_logs is not failed
+
 - name: "Make sure all containers are removed"
   docker_container:
     name: "{{ item }}"
@@ -41,6 +48,7 @@
   retries: 3
   delay: 3
   until: result is success
+
 - name: "Make sure all volumes are removed"
   command: "docker rm -f {{ item }}"
   with_items: "{{ docker_registry_setup_vnames }}"