krb5: add deprecation date for old configuration

Changed files
+1 -1
nixos
modules
config
+1 -1
nixos/modules/config/krb5/default.nix
···
cfg = config.krb5;
# This is to provide support for old configuration options (as much as is
-
# reasonable). This can probably be removed after some time.
+
# reasonable). This can be removed after 18.03 was released.
defaultConfig = {
libdefaults = optionalAttrs (cfg.defaultRealm != null)
{ default_realm = cfg.defaultRealm; };