Add Gentoo iptables handling

Change-Id: I17a3a4dc68b189a5c8b8b48d7f5960b65d672405

roles/persistent-firewall/tasks/persist/Gentoo.yaml

@@ -0,0 +1,25 @@
+- name: Persist ipv4 rules
+  become: yes
+  copy:
+    content: "{{ iptables_rules.stdout }}"
+    dest: "/var/lib/iptables/rules-save"
+
+- name: Persist ipv6 rules
+  become: yes
+  copy:
+    content: "{{ ip6tables_rules.stdout }}"
+    dest: "/var/lib/ip6tables/rules-save"
+
+- name: Ensure iptables is started
+  become: yes
+  service:
+    name: iptables-restore
+    state: started
+    enabled: yes
+
+- name: Ensure ip6tables is started
+  become: yes
+  service:
+    name: ip6tables-restore
+    state: started
+    enabled: yes