Add bond0_ab_vlan_ceph_public_backend interface

Change-Id: I73f034e8893b2e0b9d43541d2ddf685a5bdac748
diff --git "a/\173\043 roles \043\175/_linux_network_interface" "b/\173\043 roles \043\175/_linux_network_interface"
index f14f07f..1a539e1 100644
--- "a/\173\043 roles \043\175/_linux_network_interface"
+++ "b/\173\043 roles \043\175/_linux_network_interface"
@@ -18,6 +18,7 @@
         'tenant_network_gateway',
         'external_address',
         'external_network_netmask',
+        'external_vlan',
         'storage_vlan',
         'storage_address',
         'storage_network_netmask',