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test: fix gh_10506_spam_in_netbox_logs_test flaky

Before this patch the test `gh_10506_spam_in_netbox_logs_test` flaks
when we try to check that `Connection refused` error differs after
storage's restart and storage's shutdown (line 159 in updated test).
The reason of the flakiness is that net.box state machine may have
"error_reconnect" state right after a successful connection to a remote
node that was previously inactive at this address (uri). As a result,
due to the fact that net.box connection couldn't connect to storage, the
`Connection refused` error remains the same.

Now we fix the flakiness by manually waiting until the state of net.box
connection is "active".

Closes tarantool#12068

NO_CHANGELOG=flaky
NO_TEST=flaky
NO_DOC=flaky

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