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replication: allow to pass instance name as bootstrap_leader

Make it possible to specify the bootstrap leader via an instance name in
addition to its URI and UUID.

While I'm at it, change the argument order of box_check_node_name() to
comply with box_check_uuid/uri/uri_set().

Closes #8539

@TarantoolBot document
Title: `box.cfg.bootstrap_leader` accepts instance names now

The option `box.cfg.bootstrap_leader`, which specifies the desired
bootstrap leader when bootstrap_strategy is "config" now accepts
instance names.

For example, this is a valid config without replication:
```lua
box.cfg{
    instance_name = 'main-server',
    bootstrap_strategy = 'config',
    bootstrap_leader = 'main-server'
}
```

When `box.cfg` contains some entries in `replication`, the node will
bootstrap from the node which has the instance name specified in
`box.cfg.bootstrap_leader`.

This is an addition to tarantool/doc#3432

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