fix wireguard backbone link local net size

roles/install_wireguard_backbone/templates/up.sh.j2

@@ -1,7 +1,7 @@
 #!/bin/bash
 ip link add bb{{ hostvars[item]['wireguard_bb_name'] }} type wireguard
 wg setconf bb{{ hostvars[item]['wireguard_bb_name'] }} /etc/wireguard/wgbb{{ hostvars[item]['wireguard_bb_name'] }}.conf
-ip addr add {{ wireguard_bb_ipv6 }} dev bb{{ hostvars[item]['wireguard_bb_name'] }}
+ip addr add {{ wireguard_bb_ipv6 }}/64 dev bb{{ hostvars[item]['wireguard_bb_name'] }}
 ip addr add {{ wireguard_bb_ipv4 }}/32 peer {{ hostvars[item]['wireguard_bb_ipv4'] }}/32 dev bb{{ hostvars[item]['wireguard_bb_name'] }}
 ip link set up dev bb{{ hostvars[item]['wireguard_bb_name'] }}
 ip -4 rule add from all iif bb{{ hostvars[item]['wireguard_bb_name'] }} table ffmyk priority 10

roles/install_wireguard_backbone/templates/up2.sh.j2

@@ -1,7 +1,7 @@
 #!/bin/bash
 ip link add bb{{ item.name }} type wireguard
 wg setconf bb{{ item.name }} /etc/wireguard/wgbb{{ item.name }}.conf
-ip addr add {{ wireguard_bb_ipv6 }} dev bb{{ item.name }}
+ip addr add {{ wireguard_bb_ipv6 }}/64 dev bb{{ item.name }}
 ip addr add {{ wireguard_bb_ipv4 }}/32 peer {{ item.ipv4 }}/32 dev bb{{ item.name }}
 ip link set up dev bb{{ item.name }}
 ip -4 rule add from all iif bb{{ item.name }} table ffmyk priority 10