tests: Filter urllib3 retry warning log messages

Some tests like those in tests.cli.test_subcommands assert that there is
no output on stderr.
If urllib3 retries a connection, it logs a warning message which lets
those tests fail.

Signed-off-by: Marcel Bargull <marcel.bargull@udo.edu>

tests/conftest.py

@@ -1,5 +1,6 @@
 # Copyright (C) 2012 Anaconda, Inc
 # SPDX-License-Identifier: BSD-3-Clause
+from logging import getLogger
 from pathlib import Path
 
 import pytest
@@ -66,3 +67,15 @@ def clear_cuda_version():
 def do_not_register_envs(monkeypatch):
     """Do not register environments created during tests"""
     monkeypatch.setenv("CONDA_REGISTER_ENVS", "false")
+
+
+@pytest.fixture(autouse=True)
+def filter_retry_log_warning():
+    """Do not register environments created during tests"""
+    def log_filter(record):
+        return not re.match("^Retrying .* after connection broken by", record.msg)
+
+    logger = getLogger("urllib3.connectionpool")
+    logger.addFilter(log_filter)
+    yield
+    logger.removeFilter(log_filter)