Revert "Fix #1039: add bool box_txn() function"
Revert "Fix #1039: add bool box_txn() function"

This reverts commit 2d8b14166f70133734d0f346ef24e77b3fa69ecf.

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