Add reboot/halt/poweroff/suspend commands to Finit API

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/finit.h

@@ -74,6 +74,10 @@
 #define INIT_CMD_UNUSED2        14   /* Unused, was INIT_CMD_QUERY_INETD */
 #define INIT_CMD_UNUSED1        15   /* Unused, was INIT_CMD_EMIT */
 #define INIT_CMD_GET_RUNLEVEL   16
+#define INIT_CMD_REBOOT         20
+#define INIT_CMD_HALT           21
+#define INIT_CMD_POWEROFF       22
+#define INIT_CMD_SUSPEND        23
 #define INIT_CMD_WDOG_HELLO     128  /* Watchdog register and hello */
 #define INIT_CMD_SVC_ITER       129
 #define INIT_CMD_SVC_QUERY      130