Switch to Hacking 0.8 / Pep8 1.4.x

Most other projects use Hacking and flake8 for the
Pep8 checks, which provides signficant advantages:

* Many more checks for typical violations of OpenStack coding guidelines
  (less manual work for reviewers, less style nitpicking)
* more bug fixes in the pep8 checks
* Pyflakes checks - which find usual real coding bugs

Currently most of the checks are disabled via the ignore section
in tox.ini, to be reenabled in later commits.

Change-Id: Iec4d20caf640bd5ca9d796702a6bb1085c60933e

test-requirements.txt

@@ -1,9 +1,9 @@
+hacking>=0.8.0,<0.9
 coverage>=3.6
 discover
 fixtures>=0.3.14
 mock>=1.0
 ordereddict
-pep8==1.3.3
 sphinx>=1.2.1,<1.3
 testrepository>=0.0.18
 testtools>=0.9.34

tox.ini

@@ -12,8 +12,8 @@ deps = -r{toxinidir}/requirements.txt
 commands = python setup.py testr --testr-args='{posargs}'
 
 [testenv:pep8]
-deps = pep8
-commands = pep8 --repeat --show-source manilaclient setup.py
+commands =
+  flake8
 
 [testenv:venv]
 commands = {posargs}
@@ -23,3 +23,8 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 [tox:jenkins]
 downloadcache = ~/cache/pip
+
+[flake8]
+ignore = E12,H102,H23,H30,H40,H501,F
+builtins = _
+exclude = .venv,.tox,dist,doc,openstack,*egg