Set value of too_long_threshold in box_init()
Set value of too_long_threshold in box_init()

too_long_threshold was used uninitialized in txn_write_to_wal()
during box_init().

ocelot-inc/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,rtsisyk/tarantool,mejedi/tarantool,mejedi/tarantool,rtsisyk/tarantool,ocelot-inc/tarantool,ocelot-inc/tarantool,mejedi/tarantool,mejedi/tarantool