[stable-1] Fix docker tests (#1398)

* Adjust version_added, re-place tests. (#34)

* Template docker test containers.

* Forgot to adjust test.

tests/integration/targets/docker_network/tasks/tests/basic.yml

@@ -14,7 +14,7 @@
 - name: Create containers
   docker_container:
     name: "{{ container_name }}"
-    image: alpine:3.8
+    image: "{{ docker_test_image_alpine }}"
     command: /bin/sleep 10m
     state: started
   loop: