Fix gate failure on gate-trove-pep8

The gate-trove-pep8 job fails on Jenkins with the following error:

pkg_resources.VersionConflict:
(pbr 1.0.1 (/home/jenkins/workspace/gate-trove-pep8/
.tox/pep8/lib/python2.7/site-packages),
Requirement.parse('pbr<1.0,>=0.5.21'))

This is caused by the fact that pbr has now released 1.0.1 and
although most of the dependencies in Trove have switched to:

pbr>=0.11,<2.0

we are still using the hacking module from last year
(hacking>=0.8.0,<0.9), which has pbr pegged to <1.0

The hacking module needs to be updated and the new rules ignored.

The following rules are now ignored:

E111,E122,E123,E128,E251,E265,E713,F821,H105,H237,H238,H301,H305,H306,
H307,H402,H404,H405,H407,H501,H904

Change-Id: Ief129369bbffbaec7694e3f0d36668dde1772f05
Closes-Bug: #1458985

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 already pins down pep8, pyflakes and flake8
-hacking>=0.8.0,<0.9
+hacking>=0.10.0,<0.11
 sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
 oslosphinx>=2.5.0  # Apache-2.0
 

tox.ini

@@ -43,7 +43,7 @@ commands = {posargs}
 show-source = True
 # H301 and H306 are ignored on purpose.
 # The rest of the ignores are TODOs.
-ignore = F821,H301,H306,H404
+ignore = E111,E122,E123,E128,E251,E265,E713,F821,H105,H237,H238,H301,H305,H306,H307,H402,H404,H405,H407,H501,H904
 builtins = _
 exclude=.venv,.tox,dist,doc,openstack,*egg,rsdns,tools,etc,build,*.po,*.pot
 filename=*.py,trove-*