Update hacking for Python3
The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.
Fix problems found.
Change-Id: I76d42ef91d3cfc133a6f7a4dfdf982e5fec0d443
diff --git a/test-requirements.txt b/test-requirements.txt
index 337b82e..a1ec376 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
# of appearance. Changing the order has an impact on the overall integration
# process, which may cause wedges in the gate later.
-hacking<0.13,>=0.12.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
coverage!=4.4,>=4.0 # Apache-2.0
python-subunit>=1.0.0 # Apache-2.0/BSD