[PATCH 1/4] vinyl: rename tx statement begin/rollback routines

[Konstantin Osipov]

* Vladimir Davydov <vdavydov.dev at gmail.com> [19/03/05 10:25]:
> Rename vy_tx_rollback_to_savepoint to vy_tx_rollback_statement and
> vy_tx_savepoint to vy_tx_begin_statement, because soon we will do some
> extra work there.
> 
> Needed for #4016

OK to push.


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