Just use flake8 instead of hacking
We don't use hacking in Infra. Use flake8 instead.
Change-Id: I04ac08a0c4218398b43e906a6d65f75b3ff104c3
diff --git a/test-requirements.txt b/test-requirements.txt
index d528919..117f7a3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
# The order of packages is significant, because pip processes them in the order
# of appearance. Changing the order has an impact on the overall integration
# process, which may cause wedges in the gate later.
-hacking<0.11,>=0.10.2
+flake8