lxd: rename "subnet" variable to "lxd_subnet" and set it in group_vars

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

envs/prod/group_vars/roadhouse.yml

@@ -2,3 +2,4 @@
 
 local_webserver: nginx
 letsencrypt_email: webmaster@ubuntu-it.org
+lxd_subnet: 10.0.0

playbooks/roadhouse.yml

@@ -26,16 +26,15 @@
         votantonio.ubuntu-it.org: bromuro.lxd:80
 
     - role: lxd
-      subnet: 10.0.0
 
     - role: lxd-container
       name: spock
-      ip: 10.0.0.2
+      ip: "{{ lxd_subnet }}.2"
       image: debian/jessie/amd64
       expose_ports:
         - 2222
 
     - role: lxd-container
       name: bromuro
-      ip: 10.0.0.3
+      ip: "{{ lxd_subnet }}.3"
       image: ubuntu/trusty/amd64

roles/lxd/templates/dnsmasq.conf.j2

-server=/lxd/{{ subnet }}.1
+server=/lxd/{{ lxd_subnet }}.1
 bind-interfaces
 except-interface=lxdbr0

roles/lxd/templates/lxd-bridge-default.j2

@@ -17,16 +17,16 @@ LXD_DOMAIN="lxd"
 
 # IPv4
 ## IPv4 address (e.g. 10.0.8.1)
-LXD_IPV4_ADDR="{{ subnet }}.1"
+LXD_IPV4_ADDR="{{ lxd_subnet }}.1"
 
 ## IPv4 netmask (e.g. 255.255.255.0)
 LXD_IPV4_NETMASK="255.255.255.0"
 
 ## IPv4 network (e.g. 10.0.8.0/24)
-LXD_IPV4_NETWORK="{{ subnet }}.0/24"
+LXD_IPV4_NETWORK="{{ lxd_subnet }}.0/24"
 
 ## IPv4 DHCP range (e.g. 10.0.8.2,10.0.8.254)
-LXD_IPV4_DHCP_RANGE="{{ subnet }}.2,{{ subnet }}.254"
+LXD_IPV4_DHCP_RANGE="{{ lxd_subnet }}.2,{{ lxd_subnet }}.254"
 
 ## IPv4 DHCP number of hosts (e.g. 250)
 LXD_IPV4_DHCP_MAX="252"