h/m/customs: explicitly assign subnet identifiers

Auto-generated subnet identifiers are deprecated. not a problem yet with
the kea version in the pinned nixpkgs, but we're bound to hit it sooner
or later.
See: https://kea.readthedocs.io/en/kea-2.5.8/arm/dhcp4-srv.html#ipv4-subnet-identifier

Change-Id: Id4abb9e8f85b3e77f0ec33806cc64bd2b15ab972
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1963
Reviewed-by: informatic <informatic@hackerspace.pl>
diff --git a/hswaw/machines/customs.hackerspace.pl/kea.nix b/hswaw/machines/customs.hackerspace.pl/kea.nix
index b380c19..2f17571 100644
--- a/hswaw/machines/customs.hackerspace.pl/kea.nix
+++ b/hswaw/machines/customs.hackerspace.pl/kea.nix
@@ -33,6 +33,7 @@
 
         subnet4 = [
           { # general members area lan
+            id = 1;
             subnet = "10.8.0.0/16";
             pools = [{ pool = "10.8.0.20 - 10.8.0.199"; }];
             reservations-out-of-pool = false;
@@ -102,6 +103,7 @@
             };
           }
           { # bms
+            id = 2;
             subnet = "10.11.1.0/24";
             pools = [{ pool = "10.11.1.100 - 10.11.1.200"; }];
             reservations-out-of-pool = false;