src: Reorganizing source code in preparation to merge NRD code

Note that as of this commit, there are several changes in location of
compiled binaries in `build/` folder:

* `nfd` has been moved to `build/bin/nfd`
* `unit-tests` has been split into `unit-tests-core` and `unit-tests-daemon`

Change-Id: I2c830c117879edbaa5457d6423c13f0273285919
Refs: #1486
diff --git a/daemon/table/name-tree.hpp b/daemon/table/name-tree.hpp
index 4048137..2f404bf 100644
--- a/daemon/table/name-tree.hpp
+++ b/daemon/table/name-tree.hpp
@@ -24,8 +24,8 @@
 
 // Name Tree (Name Prefix Hash Table)
 
-#ifndef NFD_TABLE_NAME_TREE_HPP
-#define NFD_TABLE_NAME_TREE_HPP
+#ifndef NFD_DAEMON_TABLE_NAME_TREE_HPP
+#define NFD_DAEMON_TABLE_NAME_TREE_HPP
 
 #include "common.hpp"
 #include "name-tree-entry.hpp"
@@ -372,4 +372,4 @@
 
 } // namespace nfd
 
-#endif // NFD_TABLE_NAME_TREE_HPP
+#endif // NFD_DAEMON_TABLE_NAME_TREE_HPP