Switch to flake8+hacking.

Remove a bunch of local custom scripts. Replace with configurable
external tools.
Use local hacking checks for nova specifics.

Change-Id: I75a01375ba0ec36d2ff05abc47abe0a3f225eda5

tox.ini

@@ -18,18 +18,15 @@ sitepackages = True
 downloadcache = ~/cache/pip
 
 [testenv:pep8]
-commands = bash tools/run_pep8.sh
+sitepackages = False
+commands =
+  flake8
+  flake8 --filename=nova* bin
 
 [testenv:pylint]
 setenv = VIRTUAL_ENV={envdir}
-deps = -r{toxinidir}/tools/pip-requires
-       pylint==0.26.0
 commands = bash tools/lintstack.sh
 
-[testenv:pyflakes]
-deps = pyflakes
-commands = python tools/flakes.py nova
-
 [testenv:cover]
 # Also do not run test_coverage_ext tests while gathering coverage as those
 # tests conflict with coverage.
@@ -41,3 +38,11 @@ commands =
 
 [testenv:venv]
 commands = {posargs}
+
+[flake8]
+ignore = E12,E711,E721,E712,H302,H303,H403,H404,F
+builtins = _
+exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,plugins,tools
+
+[hacking]
+local-check-factory = nova.hacking.checks.factory