fail2ban: its tools in Go

Go is the default for module code. One binary, fail2ban-tools, serving the node-intrusion-prevention
seat's four verbs and fail2ban_settings over the SDK, with the same parsing and the same tests; read
back against the control node's live daemon.

modules/fail2ban/module.json

@@ -116,9 +116,12 @@
       {
         "name": "tools",
         "kind": "bundle",
-        "language": "typescript",
-        "entrypoints": [
-          "tools/index.js"
+        "language": "go",
+        "system": "arch",
+        "from": "cmd/fail2ban-tools",
+        "binary": "fail2ban-tools",
+        "loads": [
+          "fail2ban-tools"
         ]
       }
     ]