Add pylint wrapper

Add run_pylint.py that probe working directory for python source files
and pass them to pylint. This is needed because pylint expects module
or package, so passing a directory with no __init__.py in it makes
pylint angry. With this change, LSR_PYLINT_DIRS is no longer needed.

Additionally, we no longer need:
- init-hook in pylintrc
- [pylintrc] section in tox.ini, because the configuration from this
  section is now the part of pylintrc
- [pycodestyle] section in tox.ini, because pycodestyle linter is not
  used

tox.ini

@@ -106,23 +106,16 @@ deps =
 commands =
     black --check --diff --include "^[^.].*\.py$" --exclude "/(\.[^.].*|tests/roles)/" .
 
-# Custom role settings may set LSR_PYLINT_DIRS environment variable if there is
-# a reason to have other than default directories (library/ module_utils/ and
-# tests/). For example, network role should have this set like
-#
-#   LSR_PYLINT_DIRS="library/network_connections.py module_utils/network_lsr tests/unit/test_network_connections.py"
-#
 [testenv:pylint]
 basepython = python2.7
 setenv =
     {[base]setenv}
 deps =
+    colorama
     pylint>=1.8.4
     ansible
 commands =
-    pylint --errors-only \
-           {posargs} \
-           {env:LSR_PYLINT_DIRS:library module_utils tests}
+    {envpython} ./run_pylint.py --errors-only {posargs}
 
 [testenv:flake8]
 basepython = python2.7
@@ -223,13 +216,6 @@ show_source = true
 max-line-length = 88
 ignore = E402,W503
 
-[pylint]
-max-line-length = 88
-disable = wrong-import-position
-
-[pycodestyle]
-max-line-length = 88
-
 [travis]
 python =
   2.6: py26,extra