use enum class for status

Change-Id: Iaba23e0754335a7fecec2d6c4b3446988b2fd9d0
diff --git a/tools/ndncert-ca-server.cpp b/tools/ndncert-ca-server.cpp
index 10d6a6f..82f7c70 100644
--- a/tools/ndncert-ca-server.cpp
+++ b/tools/ndncert-ca-server.cpp
@@ -83,7 +83,7 @@
 
   if (wantRepoOut) {
       ca.setStatusUpdateCallback([&] (const CertificateRequest& request) {
-          if (request.m_status == STATUS_SUCCESS && request.m_requestType == REQUEST_TYPE_NEW) {
+          if (request.m_status == Status::SUCCESS && request.m_requestType == REQUEST_TYPE_NEW) {
             auto issuedCert = request.m_cert;
             boost::asio::ip::tcp::iostream requestStream;
 #if BOOST_VERSION >= 106700