Simplified guard names and rolled out guard route checks

- Included tests to cover for LDAP and SAML
- Updated wording for external auth id option.
- Updated 'assertPermissionError' test case to be usable in BrowserKitTests

app/Http/Controllers/Auth/ForgotPasswordController.php

@@ -30,6 +30,7 @@ class ForgotPasswordController extends Controller
     public function __construct()
     {
         $this->middleware('guest');
+        $this->middleware('guard:standard');
         parent::__construct();
     }