Add forward zones config

Change-Id: Ic42b37e1373d057b1559de321dd7ab9211defe06
diff --git a/templates/unbound.conf.j2 b/templates/unbound.conf.j2
index a1b9be7..dd23b95 100644
--- a/templates/unbound.conf.j2
+++ b/templates/unbound.conf.j2
@@ -89,3 +89,13 @@
 
 {% endfor %}
 {% endif %}
+{% if unbound_forward_zones %}
+{% for fz in unbound_forward_zones %}
+forward-zone:
+  name: "{{ fz.name | default('.') }}"
+{% for fza in fz.servers %}
+  forward-addr: {{ fza }}
+{% endfor %}
+{% endfor %}
+
+{% endif %}