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test: fix flaky gh_7581_downstream_lag_test

The test starts the cluster and immediately tries to create a space
on master. Sometimes it fails with "Can't modify data on a read-only
instance - it is an orphan" error.

When the instance is not in sync with sufficient number of nodes
it has orphan status, which means the instance is read-only. Sometimes,
the instance doesn't have enough time to connect to all instances and
get out of orphan state.

Let's add waiting until every node is connected to every other node
in the replica set.

Closes tarantool/tarantool-qa#326

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