Set asyncio_mode = auto to support the new operating modes of pytest-…

…asyncio>=0.17

- https://github.com/pytest-dev/pytest-asyncio#modes

Signed-off-by: Wade Barnes <wade@neoterictech.ca>

pytest.ini

@@ -1,4 +1,5 @@
 [pytest]
+asyncio_mode = auto
 testpaths =
     indy_common
     indy_node