Continue on bad database configuration from select scripts

Summary: Ref T11589. Provide a way for scripts to say "just continue if database config fails", and use it in `bin/config` and `bin/storage`.

Test Plan:
  - Broke database config.
  - Ran `bin/config`, worked fine.
  - Ran `bin/storage`, got helpful "set up the database" message.
  - Ran `bin/repository`, got fatal.
  - Ran normal site with valid/invalid config, got proper feedback.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11589

Differential Revision: https://secure.phabricator.com/D16502

scripts/__init_script__.php

@@ -1,24 +1,3 @@
 <?php
 
-function init_phabricator_script() {
-  error_reporting(E_ALL | E_STRICT);
-  ini_set('display_errors', 1);
-
-  $include_path = ini_get('include_path');
-  ini_set(
-    'include_path',
-    $include_path.PATH_SEPARATOR.dirname(__FILE__).'/../../');
-  @include_once 'libphutil/scripts/__init_script__.php';
-  if (!@constant('__LIBPHUTIL__')) {
-    echo "ERROR: Unable to load libphutil. Update your PHP 'include_path' to ".
-      "include the parent directory of libphutil/.\n";
-    exit(1);
-  }
-
-  phutil_load_library('arcanist/src');
-  phutil_load_library(dirname(__FILE__).'/../src/');
-
-  PhabricatorEnv::initializeScriptEnvironment();
-}
-
-init_phabricator_script();
+require_once dirname(__FILE__).'/init/init-script.php';