mgmt: fix construction of CertificateRequest in CommandAuthenticatorValidationPolicy

Just pass the KeyLocator name and let CertificateRequest deal
with constructing the Interest and setting CanBePrefix

Refs: #4582
Change-Id: I323d8ac5e16605bb978addc623e525b2536238bf
diff --git a/tools/ndn-autoconfig/multicast-discovery.cpp b/tools/ndn-autoconfig/multicast-discovery.cpp
index 267dfd9..200ae75 100644
--- a/tools/ndn-autoconfig/multicast-discovery.cpp
+++ b/tools/ndn-autoconfig/multicast-discovery.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -115,7 +115,7 @@
 {
   ControlParameters parameters;
   parameters.setName(HUB_DISCOVERY_PREFIX)
-            .setStrategy("/localhost/nfd/strategy/multicast"),
+            .setStrategy("/localhost/nfd/strategy/multicast");
 
   m_controller.start<nfd::StrategyChoiceSetCommand>(
     parameters,