tarantool / crud / 20582012014

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safe/fast mode: fix "main" fiber renaming.

Tarantool allocates net_msg_max fibers to handle
iproto requests. By default theese fibes named "main".

crud renames theese fibers to "_crud.call_on_storage/fast"
and kills them by name on safe mode enabling.

But after renaming fiber will process other non crud
requests with the new name. And on safe mode enable crud
can kill non releted fiber (for example config apply fiber).

This will cause unpredictable errors.

This commit fixes it by renaming fiber back to "main" name.

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