Add conditions for allowing traffic for controllers

We need to use in allow-traffic-for-controller.yml the same conditionals
that we have in prep-network [1] otherwise the script to allow the
traffic will be executed and, since it expects to find the BOOTSTACK_MASQ
iptables chain, will fail.

[1] roles/overcloud-prep-network/templates/overcloud-prep-network.sh.j2

Change-Id: Ia104eecbe29c1eee230c2ccbc5926ca8bfbffc83

roles/baremetal-prep-overcloud/tasks/allow-traffic-for-controller.yml

@@ -10,6 +10,8 @@
   become: yes
   shell: >
     "{{ working_dir }}"/allow-traffic-for-controller.sh
-  when: network_isolation|bool and undercloud_type == "baremetal"
-
-
+  when:
+    - network_isolation|bool
+    - undercloud_type == "baremetal"
+    - not overcloud_ipv6|bool
+    - release in ['newton','ocata','pike','queens'] or not containerized_undercloud|bool