host_vars/*: Split the netmask into a separate variable

host_vars/apollo.archlinux.org

 ---
 
 ipv4_address: "138.201.81.199"
-ipv6_address: "2a01:4f8:172:1d86::1/128"
+ipv4_netmask: "/32"
+ipv6_address: "2a01:4f8:172:1d86::1"
+ipv6_netmask: "/128"
 ipv4_gateway: "138.201.81.193"
 ipv6_gateway: "fe80::1"
 filesystem: btrfs

host_vars/orion.archlinux.org

 ---
 ipv4_address: "88.198.91.70"
-ipv6_address: "2a01:4f8:160:6087::1/128"
+ipv4_netmask: "/32"
+ipv6_address: "2a01:4f8:160:6087::1"
+ipv6_netmask: "/128"
 ipv4_gateway: "88.198.91.65"
 ipv6_gateway: "fe80::1"
 filesystem: btrfs

host_vars/soyuz.archlinux.org

+
 ---
 ipv4_address: "138.201.206.85"
-ipv6_address: "2a01:4f8:173:1654::1/128"
+ipv4_netmask: "/32"
+ipv6_address: "2a01:4f8:173:1654::1"
+ipv6_netmask: "/128"
 ipv4_gateway: "138.201.206.65"
 ipv6_gateway: "fe80::1"
 filesystem: btrfs

host_vars/vostok.archlinux.org

 ---
 
 ipv4_address: "5.9.158.171"
-ipv6_address: "2a01:4f8:190:51aa::1/128"
+ipv4_netmask: "/32"
+ipv6_address: "2a01:4f8:190:51aa::1"
+ipv6_netmask: "/128"
 ipv4_gateway: "5.9.158.161"
 ipv6_gateway: "fe80::1"
 filesystem: ext4