use tox to run pylint

Also allow pylint to be run from a virtualenv

requirements/dev.txt

@@ -10,3 +10,4 @@ git+https://github.com/saltstack/pytest-salt.git@master#egg=pytest-salt
 # satisfy other requirements, and httpretty 0.8.10 has bugs in setup.py that
 # prevent it from being successfully installed (at least on Python 3.4).
 httpretty; python_version >= '3.4'
+pylint==1.6.5

salt/netapi/rest_tornado/saltnado.py

@@ -210,7 +210,7 @@ import tornado
 TORNADO_50 = tornado.version_info >= (5,)
 
 if not TORNADO_50:
-    import zmq.eventloop.ioloop
+    import zmq.eventloop.ioloop   # pylint: disable=import-error
     # instantiate the zmq IOLoop (specialized poller)
     zmq.eventloop.ioloop.install()
 

salt/utils/versions.py

@@ -14,8 +14,8 @@
 # Import python libs
 from __future__ import absolute_import
 # pylint: disable=blacklisted-module
-from distutils.version import StrictVersion as _StrictVersion
-from distutils.version import LooseVersion as _LooseVersion
+from distutils.version import StrictVersion as _StrictVersion  # pylint: disable=no-name-in-module
+from distutils.version import LooseVersion as _LooseVersion  # pylint: disable=no-name-in-module
 # pylint: enable=blacklisted-module
 
 # Import 3rd-party libs

setup.py

@@ -366,7 +366,7 @@ class DownloadWindowsDlls(Command):
         import pip
         # pip has moved many things to `_internal` starting with pip 10
         if LooseVersion(pip.__version__) < LooseVersion('10.0'):
-            from pip.utils.logging import indent_log
+            from pip.utils.logging import indent_log  # pylint: disable=no-name-in-module
         else:
             from pip._internal.utils.logging import indent_log  # pylint: disable=no-name-in-module
         platform_bits, _ = platform.architecture()

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36
+envlist = py27,py34,py35,py36,pylint
 skip_missing_interpreters = True
 skipsdist = True
 
@@ -9,6 +9,14 @@ commands = pytest --rootdir {toxinidir} {posargs}
 passenv = LANG HOME
 sitepackages = True
 
+[testenv:pylint]
+basepython = python2.7
+deps = -r{toxinidir}/requirements/dev.txt
+commands =
+  pylint --rcfile=.testing.pylintrc --disable=W1307,str-format-in-logging setup.py salt/
+  pylint --rcfile=.testing.pylintrc --disable=W0232,E1002,W1307,str-format-in-logging tests/
+sitepackages = False
+
 [pytest]
 addopts = --log-file /tmp/salt-runtests.log --no-print-logs --ssh-tests -ra -sv
 testpaths = tests