TESTS: replace old test suite with the new one

get rid of Bats definitively

test/test_default-host.py

@@ -0,0 +1,7 @@
+import pytest
+
+
+def test_fallback_on_default(docker_compose, nginxproxy):
+    r = nginxproxy.get("http://unknown.nginx-proxy.tld/port")
+    assert r.status_code == 200
+    assert r.text == "answer from port 81\n"