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/sm.c

@@ -145,6 +145,9 @@ restart:
 		if (runlevel != 0 && runlevel != 6)
 			conf_reload_dynamic();
 
+		/* Reset once flag of runtasks */
+		service_runtask_clean();
+
 		_d("Stopping services services not allowed in new runlevel ...");
 		sm->in_teardown = 1;
 		service_step_all(SVC_TYPE_ANY);