test: setup logging in topology suites

Make it possible to use logging from within tests in the topology
suites. The tests are executed using `pytest`, which uses a `pytest.ini`
file for logging configuration.

Also cleanup the `pytest.ini` files a bit.

test/topology/pytest.ini

@@ -1,7 +1,6 @@
-# Pytest configuration file. If we don't have one in this directory,
-# pytest will look for one in our ancestor directories, and may find
-# something irrelevant. So we should have one here, even if empty.
 [pytest]
-# Use shared fixtures from the parent dir
-addopts = --confcutdir ..
 asyncio_mode = auto
+
+log_cli = true
+log_format = %(asctime)s %(levelname)s %(message)s
+log_date_format = %Y-%m-%d %H:%M:%S

test/topology_raft_disabled/pytest.ini

@@ -2,6 +2,8 @@
 # pytest will look for one in our ancestor directories, and may find
 # something irrelevant. So we should have one here, even if empty.
 [pytest]
-# Use shared fixtures from the parent dir
-addopts = --confcutdir ..
 asyncio_mode = auto
+
+log_cli = true
+log_format = %(asctime)s %(levelname)s %(message)s
+log_date_format = %Y-%m-%d %H:%M:%S