Redirect kmsg to /dev/log and detect hungup

1. ihkmond retrieves kmsg when the amount of kmsg exceeds the threashold and
   /dev/mcosX is deleted
2. ihkmond periodically monitors OS status change to detect hungup

kernel/include/kmsg.h

@@ -13,9 +13,8 @@
 #ifndef KMSG_H
 #define KMSG_H
 
+void kmsg_init(void);
 void kputs(char *buf);
 int kprintf(const char *format, ...);
 
-void kmsg_init(int);
-
 #endif