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test: fix flakiness in gh_5568_read_only_reason

The test has two groups, in front of each of which, a cluster is
created. Sometimes, it fails on the first test in every group:
either ro_reason is explicitly checked and it equals to `orphan`,
not nil, or we try to write to a still read-only instance and get
the error, that it's orphan.

The problem is the fact, that we don't wait until the connections
are established in a cluster. Let's add waiting for full mesh
in cluster creation.

Closes tarantool/tarantool-qa#320

NO_CHANGELOG=test fix
NO_DOC=test fix

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