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_manager_main.cpp b/network_manager_main.cpp
index 62d12af..89ba7b3 100644
--- a/network_manager_main.cpp
+++ b/network_manager_main.cpp
@@ -1,9 +1,9 @@
 #include "config.h"
+#include "dns_updater.hpp"
 #include "network_manager.hpp"
 #include "rtnetlink_server.hpp"
 #include "timer.hpp"
 #include "watch.hpp"
-#include "dns_updater.hpp"
 
 #include <linux/netlink.h>