remove os_firewall creation of DOCKER chain

roles/os_firewall/tasks/firewall/iptables.yml

@@ -41,14 +41,6 @@
   changed_when: "'firewalld' in result.stdout"
   when: pkg_check.rc == 0
 
-# Workaround for Docker 1.4 to create DOCKER chain
-- name: Add DOCKER chain
-  os_firewall_manage_iptables:
-    name: "DOCKER chain"
-    action: verify_chain
-    create_jump_rule: no
-# End of Docker 1.4 workaround
-
 - name: Add iptables allow rules
   os_firewall_manage_iptables:
     name: "{{ item.service }}"