Add very basic bin/auth tool

Summary: Ref T1536. This script basically exists to restore access if/when users shoot themselves in the foot by disabling all auth providers and can no longer log in.

Test Plan: {F46411}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1536

Differential Revision: https://secure.phabricator.com/D6205

scripts/setup/manage_auth.php

@@ -0,0 +1,22 @@
+#!/usr/bin/env php
+<?php
+
+$root = dirname(dirname(dirname(__FILE__)));
+require_once $root.'/scripts/__init_script__.php';
+
+$args = new PhutilArgumentParser($argv);
+$args->setTagline('manage authentication');
+$args->setSynopsis(<<<EOSYNOPSIS
+**auth** __command__ [__options__]
+    Manage Phabricator authentication configuration.
+
+EOSYNOPSIS
+  );
+$args->parseStandardArguments();
+
+$workflows = array(
+  new PhabricatorAuthManagementListWorkflow(),
+  new PhutilHelpArgumentWorkflow(),
+);
+
+$args->parseWorkflows($workflows);