Bump hacking min version to 3.0.1

flake8 new version 3.8.0 added new pycodestyle with new rules.
The new hacking version 3.0.1 caps flake8<3.8.0.

Change-Id: I27e40bddf7173b39a0f30c0763b6bba31f0ae6b9

test-requirements.txt

@@ -1,7 +1,7 @@
 # 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>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0.1,<3.1.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 docutils>=0.11 # OSI-Approved Open Source, Public Domain