sql: fix segfault with check referencing new table

Starting from 9a543202 on tuple insertion in _space we
execute sql_checks_resolve_space_def_reference for checks
if any on executing on_replace_dd_space trigger. Routine
box_space_id_by_name that takes a look to _space space
returns not-null value, at the same time space object
doesn't present in space cache and can't be found by
space_by_id.
Before 1.10 patch 0ecabde8 was merged to 2.0 as a part of
13df2b1f box_space_id_by_name used to return BOX_ID_NIL
due to "multi-engine transaction error" that is not raised
in same situation now.

Closes #3611.