Make `wait_for_any_log()` function to work closer to the original
dtest's version: use `ScyllaLogFile.grep()` method instead of
the usage of `ScyllaNode.wait_log_for()` with a small timeout to
have at least one try to find.
Also, add `max_count` argument to `.grep()` method for the
optimization purpose.
Copy wait_for_any_log() function from dtest tools/log_utils.py
with few modifications:
- Add type hints;
- Change timeout for node.watch_log_for() calls from 0 to 0.1
because dtest shim's implementation uses asyncio.timeout()
and 0 means not "one time" but "never run";
- Use set() instead of list() for `ret` variable;
- Remove redundant `found` variable.
- Remove `remaining` variable and use shallow copies to make
the code more correct. As a side effect this makes the
TimeoutError message more correct too;
- Use f-string formatting for TimeoutError message;
Use universalasync library to make test.py async code compatible
with synchronous code of dtest/ccm
Also, copied unmodified error_example_test.py from dtest as an example.
Run the test in `dev` mode only.
