Remove docker pip packages and add docker chains to iptables

defaults/main.yml

-docker_pip_packages:
-  - 'docker'
-  - 'docker-py'
+docker_pip_packages: []
 docker_subnet: false
 docker_compose_version: '1.17.1'

tasks/install.yml

@@ -66,3 +66,10 @@
     owner: 'root'
     group: 'root'
     mode: '644'
+
+- name: "Add iptables chains"
+  iptables:
+    chain: '{{ item }}'
+  with_items:
+    - 'DOCKER'
+    - 'DOCKER-ISOLATION'