Blacklist stestr 2.3.0
This version has been blacklisted in global-requirements. It's not
likely that it will get used since pip will try to grab the latest, but
let's be explicit and make sure it never is.
@@ -7,7 +7,7 @@ hacking>=2.0.0 # Apache-2.0
flake8-import-order # LGPLv3
flake8-logging-format>=0.6.0 # Apache-2.0
-stestr>=2.2.0 # Apache-2.0
+stestr!=2.3.0,>=2.2.0 # Apache-2.0
coverage!=4.4,>=4.0 # Apache-2.0
ddt>=1.2.1 # MIT
fixtures>=3.0.0 # Apache-2.0/BSD
