Track run/tasks, should run at least once per declared runlevel

This patch adds a 'once' counter to the svc_t for run/task jobs.  This
counter is incremented when Finit calls service_start() and is reset on
runlevel changes.

Also, at the end of a runlevel each run/task have their state reset to
SVC_HALTED_STATE so they can be launched again for the new runlevel, if
so declared.

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

src/service.h

@@ -31,6 +31,7 @@ void	  service_runlevel	 (int newlevel);
 int	  service_register	 (int type, char *line, struct rlimit rlimit[], struct timeval *mtime);
 void      service_unregister     (svc_t *svc);
 
+void      service_runtask_clean  (void);
 void      service_reload_dynamic (void);
 
 void      service_step           (svc_t *svc);