Set alarm timer for grace period from the grace_period variable, instead

of hard-coding a value of 10 seconds. Command line flag -g is thus now
correctly taken into account.

PR:		bin/102176
MFC after:	1 week

usr.sbin/rpc.lockd/lockd.c

@@ -203,7 +203,7 @@ main(argc, argv)
 		exit(1);
 	}
 	grace_expired = 0;
-	alarm(10);
+	alarm(grace_period);
 
 	init_nsm();