[CI] Update hacking and fix pep8 errors

Recent release of pbr 2.0.0 requires us to update hacking in
rally requirements.

* Added missing new lines at the end of files
* Skipped H105 (Don't use author tags). These lines cannot be
  removed without an agreement with the author.

Change-Id: Iac581ea4ded8ef85cd8a5bc204ac0c4436088eb6

test-requirements.txt

@@ -2,8 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-# [do-not-touch] we need to modify our code to support latest release
-hacking>=0.9.2,<0.10                                   # Apache Software License
+hacking!=0.13.0,<0.14,>=0.12.0                         # Apache-2.0
 
 pytest>=2.7,<=3.0.6                                    # MIT
 # py.test plugin for measuring coverage.

tox.ini

@@ -76,7 +76,7 @@ deps = requests[security]
 commands = python {toxinidir}/tests/ci/sync_requirements.py {posargs}
 
 [flake8]
-ignore = H703
+ignore = H703,H105
 show-source = true
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build,setup.py