added "open" to network teplate

Author: Richard Stempfl

templates/network.xml.j2

@@ -2,7 +2,7 @@
   <name>{{ item.name }}</name>
   {% if item.mode is defined %}<forward mode='{{ item.mode }}'/>{% endif %}
   <bridge name='{{ item.bridge }}'/>
-{% if item.mode is not defined or item.mode in ['route', 'nat'] %}
+{% if item.mode is not defined or item.mode in ['route', 'nat', 'open'] %}
   <domain name='{{ item.domain|default(item.name) }}'/>
   <ip address='{{ item.ip }}' netmask='{{ item.netmask }}'>
   {% if item.dhcp_start is defined and item.dhcp_end is defined %}