test: update test-run (don't clean UUID function)

There are several updates in test-run:

* Unit testing and coverage collecting for test-run ([1]).
  (Plus a fixup for `--disable-schema-upgrade` for Python 3.5.)
* Allow to miss a timeout in test_run:wait_log(): it is 60 seconds by
  default ([2]).
* pretest_clean: add built-in `UUID()` SQL function ([3]).

[1]: https://github.com/tarantool/test-run/pull/283
[2]: https://github.com/tarantool/test-run/pull/306
[3]: https://github.com/tarantool/test-run/pull/307