vinyl: continue renames/coding style cleanup
vinyl: continue renames/coding style cleanup

* SX -> TX
* sxmanager -> tx_manager
* sxindex -> tx_index

rtsisyk/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,rtsisyk/tarantool,mejedi/tarantool,mejedi/tarantool,mejedi/tarantool,mejedi/tarantool