Add forwarding hint support

Change-Id: Ie8a1d45f3abe0377a3b6c0cff08d27824b2861b1
diff --git a/src/requester-request.cpp b/src/requester-request.cpp
index 5d9896f..e8d6b26 100644
--- a/src/requester-request.cpp
+++ b/src/requester-request.cpp
@@ -277,6 +277,9 @@
 {
   Name interestName = m_issuedCertName;
   auto interest = std::make_shared<Interest>(interestName);
+  if (!m_forwardingHint.empty()) {
+    interest->setForwardingHint({m_forwardingHint});
+  }
   interest->setMustBeFresh(false);
   interest->setCanBePrefix(false);
   return interest;