If after recovery first client to invoke SQL differs from
ADMIN, then initialization of SQL subsystem will fail due to
insufficient access rights. Problem is that SQL invokes
create_from_tuple() to fill space_def structure, which in turn
verifies access right.
As far as SQL is a static part of Tarantool, there's no sense
to initialize the system by demand. Change performs data dictionary
initialization upon config completion.
Regression test added as well.

Closes #2483