banlist: simplify script, remove package

We're now directly using Greg's unmodified banlist which
simplifies the update process.

The banlist package with its dependency on the bitcoin datadir path is only
relevant for internal use within nix-bitcoin, so we can safely remove
it.

We're now using the bitcoin-cli from `services.bitcoind.package`.

Fixes #129

modules/bitcoind.nix

@@ -264,6 +264,9 @@ in {
             else nix-bitcoin-services.allowAnyIP)
         // optionalAttrs (cfg.zmqpubrawblock != null || cfg.zmqpubrawtx != null) nix-bitcoin-services.allowAnyProtocol;
     };
+
+    # Use this to update the banlist:
+    # wget https://people.xiph.org/~greg/banlist.cli.txt
     systemd.services.bitcoind-import-banlist = {
       description = "Bitcoin daemon banlist importer";
       requires = [ "bitcoind.service" ];
@@ -289,11 +292,16 @@ in {
             sleep 1
         done
       '';
+
       serviceConfig = {
         Type = "simple";
         User = "${cfg.user}";
         Group = "${cfg.group}";
-        ExecStart = "${pkgs.bash}/bin/bash ${pkgs.banlist}/bin/banlist ${pkgs.blockchains.bitcoind}";
+        script = ''
+          echo "Importing node banlist..."
+          cd ${cfg.cli}/bin
+          . ${./banlist.cli.txt}
+        '';
 
         # Permission for preStart
         PermissionsStartOnly = "true";

modules/nix-bitcoin.nix

@@ -189,7 +189,6 @@ in {
       blockchains.bitcoind
       (hiPrio config.services.bitcoind.cli)
       nodeinfo
-      banlist
       jq
       qrencode
     ]