dch-gw: Add Management network

The Management network (VLAN 10, 172.30.0.240/28) will be used for
communication with and configuration of network devices including
switches and access points. This keeps configuration separate from
normal traffic, and allows complete isolation of infrastructure devices.

host_vars/gw0/network.yml

@@ -53,6 +53,13 @@ network:
     addr: 172.30.0.1
     prefix: 26
     addr6: fd99:8cd7:6528:fe1e::1
+  - ifname: vlan10
+    enabled: true
+    vlan_id: 10
+    physdev: bond0
+    mode: manual
+    addr: 172.30.0.241
+    prefix: 28
 
 dhcpcd_send_hostname: false
 dhcpcd_ntp_servers: false