change from a /16 subnet to a /24 subnet

With the transition to the new ninux-compatible network we choose to
have a ip pool for vm that resides on the 10.150.42 network.
As 254 unique addresses are sufficient for our need we reduce the subnet
to a /24

roles/lxc_guest/templates/config.j2

@@ -10,6 +10,6 @@ lxc.network.type = veth
 lxc.network.flags = up
 lxc.network.link = br0
 lxc.network.name = eth0
-lxc.network.ipv4 = {{ hostvars[vm_name]['ansible_host'] }}/16
+lxc.network.ipv4 = {{ hostvars[vm_name]['ansible_host'] }}/24
 lxc.network.ipv4.gateway = {{ hostvars[ext_gateway]['ansible_host'] }}
 lxc.start.auto = {% if auto_start %}1{% else %}0{% endif %}