reorder headers

Reordering all the headers to the following structure:

header file:
local
c
cpp (including openbmc libraries)

source file:
source.hpp (if applicable)
local
c
cpp

Change-Id: Ia74a5c761a3029819366159de3cfd40c5e4c4a2c
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/network_config.cpp b/network_config.cpp
index d492bf3..d3b560f 100644
--- a/network_config.cpp
+++ b/network_config.cpp
@@ -1,5 +1,7 @@
-#include "config.h"
 #include "network_config.hpp"
+
+#include "config.h"
+
 #include <fstream>
 #include <string>