tarantool / test-run / 5122956756

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Prettify messages about log files

The ideas behind the change:

* The log is sometimes from a tarantool instance, but a luatest based
  test may print logs from another process to stderr. Use more general
  term 'log' to don't confuse anyone.
* Replace term 'instance' with 'test-run server' due to the same
  reasons.
* Make zero size and no file situations more explicit.
* Catch and report 'no logfile property' situation (shouldn't occur, but
  was semi-handled by this code previously for some reason).
* Reduce code reusability for the sake of readability and to ease future
  modifications.

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