Cleanup of the node-id.h files. The node-id.h file contains

declarations of functions for setting and getting a node ID number, a
functionality that exists on many platforms. Since this functionality
was not considered part of the Contiki core, each platform defined its
own node-id.h file. This commit attempts to clean this up by
collecting the node-id.h into a core/sys/node-id.h file that replaces
the old node-id.h files from the platform directories.

examples/er-rest-example/static-routing.c

@@ -21,7 +21,7 @@
 #endif
 
 #include "contiki-net.h"
-#include "node-id.h"
+#include "sys/node-id.h"
 
 int node_rank;
 

examples/ipv6/simple-udp-rpl/unicast-sender.c

@@ -38,7 +38,7 @@
 #include "net/uip-ds6.h"
 #include "net/uip-debug.h"
 
-#include "node-id.h"
+#include "sys/node-id.h"
 
 #include "simple-udp.h"
 #include "servreg-hack.h"

examples/rime/example-rucb.c

@@ -104,7 +104,7 @@ const static struct rucb_callbacks rucb_call = {write_chunk, read_chunk,
 						NULL};
 static struct rucb_conn rucb;
 /*---------------------------------------------------------------------------*/
-#include "node-id.h"
+#include "sys/node-id.h"
 
 PROCESS_THREAD(example_rucb_process, ev, data)
 {

examples/rime/example-rudolph2.c

@@ -140,7 +140,7 @@ const static struct rudolph2_callbacks rudolph2_call = {write_chunk,
 							read_chunk};
 static struct rudolph2_conn rudolph2;
 /*---------------------------------------------------------------------------*/
-#include "node-id.h"
+#include "sys/node-id.h"
 
 PROCESS_THREAD(example_rudolph2_process, ev, data)
 {

examples/sky/test-deluge.c

@@ -40,7 +40,7 @@
 #include "contiki.h"
 #include "cfs/cfs.h"
 #include "deluge.h"
-#include "node-id.h"
+#include "sys/node-id.h"
 
 #include <stdio.h>
 #include <string.h>

examples/udp-stream/udp-stream.c

@@ -41,7 +41,7 @@
 #include "contiki-net.h"
 #include "uip.h"
 #include "net/rpl/rpl.h"
-#include "node-id.h"
+#include "sys/node-id.h"
 #include "servreg-hack.h"
 
 #include "cfs/cfs.h"