core: move common.hpp to core/
Headers in core/ are now included as `#include "core/*.hpp"`.
This allows NFD to rely less on include paths when used as a submodule in
another codebase, such as ndnSIM and NFD-Android.
refs #3127
Change-Id: Ia38f3c97427e17ff7b5401281f1fe875b5d5313e
diff --git a/tools/nfd-status/format-helpers.hpp b/tools/nfd-status/format-helpers.hpp
index 11d3d5a..f98d8f1 100644
--- a/tools/nfd-status/format-helpers.hpp
+++ b/tools/nfd-status/format-helpers.hpp
@@ -26,7 +26,7 @@
#ifndef NFD_TOOLS_NFD_STATUS_FORMAT_HELPERS_HPP
#define NFD_TOOLS_NFD_STATUS_FORMAT_HELPERS_HPP
-#include "common.hpp"
+#include "core/common.hpp"
namespace nfd {
namespace tools {