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/daemon/mgmt/nfd-manager-base.hpp b/daemon/mgmt/nfd-manager-base.hpp
index 6273624..c7f30ff 100644
--- a/daemon/mgmt/nfd-manager-base.hpp
+++ b/daemon/mgmt/nfd-manager-base.hpp
@@ -26,7 +26,7 @@
 #ifndef NFD_DAEMON_MGMT_NFD_MANAGER_BASE_HPP
 #define NFD_DAEMON_MGMT_NFD_MANAGER_BASE_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 #include "command-validator.hpp"
 #include "core/manager-base.hpp"