test: fix flakiness of replication/qsync_basic
The async transactions should always wait for LSN from the master after switch to replica. Closes tarantool/tarantool-qa#274 NO_CHANGELOG=testing NO_DOC=testing
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The async transactions should always wait for LSN from the master after switch to replica. Closes tarantool/tarantool-qa#274 NO_CHANGELOG=testing NO_DOC=testing
mentioned in commit c69537ab