Add inside and outside roles for VLANs

Will probably rename inside/outside and office/server to int/ext.

roles/firewall/templates/networks.nft.j2

@@ -0,0 +1,9 @@
+{% for vlan in vlans %}
+set {{ vlan.name }}  {
+    type ipv4_addr; flags interval
+}
+set {{ vlan.name }}/6 {
+    type ipv6_addr; flags interval
+}
+
+{% endfor %}