Add CaConfig to support CA configuration

Change-Id: I3095b4c8fbe70c2f5b8e27722c0e85d1ec801aba
diff --git a/src/ndncert-common.hpp b/src/ndncert-common.hpp
index 6e93164..519b00f 100644
--- a/src/ndncert-common.hpp
+++ b/src/ndncert-common.hpp
@@ -23,7 +23,7 @@
 
 #include "ndncert-config.hpp"
 
-#ifdef WITH_TESTS
+#ifdef HAVE_TESTS
 #define VIRTUAL_WITH_TESTS virtual
 #define PUBLIC_WITH_TESTS_ELSE_PROTECTED public
 #define PUBLIC_WITH_TESTS_ELSE_PRIVATE public