merge two onInterest callback into one

Change-Id: I82e8150239d795cb465ea2526624300590e4434c
diff --git a/src/certificate-request.cpp b/src/certificate-request.cpp
index b205531..15b1fb2 100644
--- a/src/certificate-request.cpp
+++ b/src/certificate-request.cpp
@@ -26,7 +26,7 @@
 
 CertificateRequest::CertificateRequest() = default;
 
-CertificateRequest::CertificateRequest(const Name& caName, const std::string& requestId, int requestType, Status status,
+CertificateRequest::CertificateRequest(const Name& caName, const std::string& requestId, RequestType requestType, Status status,
                                        const security::v2::Certificate& cert)
     : m_caPrefix(caName)
     , m_requestId(requestId)
@@ -36,7 +36,7 @@
 {
 }
 
-CertificateRequest::CertificateRequest(const Name& caName, const std::string& requestId, int requestType, Status status,
+CertificateRequest::CertificateRequest(const Name& caName, const std::string& requestId, RequestType requestType, Status status,
                                        const std::string& challengeStatus, const std::string& challengeType,
                                        const std::string& challengeTp, int remainingTime, int remainingTries,
                                        const JsonSection& challengeSecrets, const security::v2::Certificate& cert)