Fix tests broken by the recent RabbitMQ/Cassandra async fixes (#815)

- Fix invalid key in config causing rogue warning
- Fix asyncio test tags

tests/pytest.ini

@@ -1,6 +1,5 @@
 [pytest]
 testpaths = tests
-python_paths = .
 python_files = test_*.py
 python_classes = Test*
 python_functions = test_*
@@ -8,7 +7,7 @@ addopts =
     -v
     --tb=short
     --strict-markers
-    --disable-warnings
+#    --disable-warnings
 #    --cov-fail-under=80
 asyncio_mode = auto
 markers =