Added Bandit configuration to ignore assert usage

The Codacy seems to use Bandit which generates warning from
every assert in Pytest tests /1/. This should be ignored
with this file that skips B101: assert_used /2/.

/1/ fossasia/query-server#332
/2/ https://docs.openstack.org/bandit/latest/plugins/assert_used.html

Signed-off-by: Heikki Laaksonen <laaksonen.heikki.j@gmail.com>

bandit.yml

@@ -0,0 +1 @@
+skips: ['B101']