Add pep8 job and fix pep8 errors

Move test requirements to the separated file

Change-Id: I4e6e163ede94fb2337c4b0d3ea021a4a6c2c77f4

requirements.txt

@@ -2,5 +2,3 @@ rst2pdf
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 sphinxcontrib-httpdomain
 sphinx_rtd_theme
-testrepository>=0.0.18
-testtools>=0.9.34

test-requirements.txt

@@ -0,0 +1,4 @@
+hacking>=0.10.0,<0.11
+
+testrepository>=0.0.18
+testtools>=0.9.34

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = docs,py27
+envlist = docs,py27,pep8
 minversion = 1.6
 skipsdist = True
 
@@ -13,15 +13,23 @@ setenv = VIRTUAL_ENV={envdir}
          LANG=en_US.UTF-8
          LANGUAGE=en_US:en
          LC_ALL=C
-deps = -r{toxinidir}/requirements.txt
+deps = -r{toxinidir}/test-requirements.txt
 commands =
   python setup.py test --slowest --testr-args='{posargs}'
 
 [testenv:venv]
 commands = {posargs}
 
+[testenv:pep8]
+commands = flake8
+
 [testenv:docs]
 commands =
     sphinx-build -b html doc/source/ doc/build/html
     sphinx-build -b latex doc/source/ doc/build/latex
     sphinx-build -b pdf doc/source/ doc/build/pdf
+
+[flake8]
+show-source = true
+builtins = _
+exclude=.venv*,.git,.tox,dist,doc,*lib/python*,*egg,build