Configure vlan on host

This commit includes the configuration of vlans on the host
for virtual machines. By configuring a bridge on the br0 interface
we can host the virtual machine vlan and by setting a vlan on the
logical device we can include it into the management vlan.
All variables are included from playbook

prepare_host.yaml

@@ -1,5 +1,8 @@
 ---
 - hosts: vm_hosts
+  vars:
+    management_vlan: 9
+    virtual_machine_vlan: 13
   tasks:
     - name: install lxc related packages
       apt:

templates/interfaces.j2

@@ -9,9 +9,13 @@ iface lo inet loopback
 
 # The primary network interface
 auto br0
-iface br0 inet static
-        address {{ ansible_default_ipv4.address }}
-        netmask 255.255.0.0
-        gateway {{ hostvars[ext_gateway]['ansible_host'] }}
-        bridge_ports eth0
+iface br0 inet manual
+        bridge_ports eth0.{{ virtual_machine_vlan }}
         bridge_fd 1
+
+auto eth0.{{ management_vlan }}
+iface eth0.{{ management_vlan }} inet static
+	address {{ ansible_default_ipv4.address }}
+        gateway {{ hostvars[ext_gateway]['ansible_host'] }}
+        netmask 255.255.255.0
+	vlan-raw-device eth0