Bump hacking min version to 3.0.1

hacking 3.0.1 fix the pinning of flake8 to avoid bringing in a new
version with new checks.

bumping the min version for hacking so that any older hacking versions
which auto adopt the new checks are not used.

Change-Id: I5875f1c0261ff6039773d7daf412102f2c02651f

Author: wangzihao

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>=3.0,<3.1.0 # Apache-2.0
+hacking>=3.0.1,<3.1.0 # Apache-2.0
 
 # remove this pyflakes from here once you bump the
 # hacking to 3.2.0 or above. hacking 3.2.0 takes