Migrate to flake8.

Closes bug 1172444

Change-Id: I4831946d01f05c2a10264745a07b53fa48be44c8

tools/test-requires

@@ -1,3 +1,9 @@
+# Install bounded pep8/pyflakes first, then let flake8 install
+pep8==1.4.5
+pyflakes==0.7.2
+flake8==2.0
+hacking>=0.5.3,<0.6
+
 # Optional backend: SQL
 pysqlite
 
@@ -14,8 +20,6 @@ nose # for test discovery and console feedback
 nosexcover
 openstack.nose_plugin
 nosehtmloutput
-pylint # static code analysis
-pep8==1.3.3 # checks for PEP8 code style compliance
 Sphinx>=1.1.2 # required to build documentation
 unittest2 # backport of unittest lib in python 2.7
 webtest # test wsgi apps without starting an http server

tox.ini

@@ -16,8 +16,8 @@ commands = nosetests {posargs}
 
 [testenv:pep8]
 commands =
-  pep8 --exclude=.venv,.tox,dist,doc,openstack,vendor,*egg --repeat --show-source .
-  pep8 --repeat --show-source --filename=keystone* bin
+  flake8
+  flake8 --filename=keystone* bin
 
 [tox:jenkins]
 downloadcache = ~/cache/pip
@@ -28,6 +28,8 @@ setenv = NOSE_WITH_COVERAGE=1
 [testenv:venv]
 commands = {posargs}
 
-[testenv:pyflakes]
-deps = pyflakes
-commands = python tools/flakes.py keystone
+[flake8]
+show-source = true
+ignore = H,F841,F401,F403
+builtins = _
+exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,tools,vendor