tox.ini adaptations for jenkins

tox.ini

 [tox]
 envlist = py27,flake8
 
+[tox:jenkins]
+envlist = py27,flake8-jenkins
+
 [testenv]
 sitepackages = true
 deps =
@@ -15,5 +18,12 @@
 deps =
   flake8
 commands = flake8
+[testenv:flake8-jenkins]
+skip_install = true
+whitelist_externals =
+  flake8
+deps =
+  flake8
+commands = flake8 --exit-zero --show-source --output-file=code_quality.log {toxinidir}
 
 [flake8]
@@ -18,3 +28,6 @@
 
 [flake8]
-exclude = migration/*,test/data/*,setup.py,.tox/*
+format = pylint
+max-line-length = 100
+ignore = E731,W503
+exclude = __pkginfo__.py,migration/*,test/data/*,setup.py,.tox/*