Add back pylint as info-only for core (#3515)

Author: Jon Wayne Parrott

.gitignore

@@ -56,7 +56,8 @@ coverage.xml
 system_tests/local_test_setup
 
 # Make sure a generated file isn't accidentally committed.
-scripts/pylintrc_reduced
+pylintrc
+pylintrc.test
 
 # Directories used for creating generated PB2 files
 generated_python/

core/nox.py

@@ -14,8 +14,6 @@
 
 from __future__ import absolute_import
 
-import os
-
 import nox
 
 
@@ -43,15 +41,22 @@ def unit_tests(session, python_version):
 
 @nox.session
 def lint(session):
-    """Run flake8.
+    """Run linters.
 
-    Returns a failure if flake8 finds linting errors or sufficiently
+    Returns a failure if the linters find linting errors or sufficiently
     serious code quality issues.
     """
     session.interpreter = 'python3.6'
-    session.install('flake8')
+    session.install('flake8', 'pylint', 'gcp-devrel-py-tools')
     session.install('.')
     session.run('flake8', 'google/cloud/core')
+    session.run(
+        'gcp-devrel-py-tools', 'run-pylint',
+        '--config', 'pylint.config.py',
+        '--library-filesets', 'google',
+        '--test-filesets', 'tests',
+        # Temporarily allow this to fail.
+        success_codes=range(0, 100))
 
 
 @nox.session

core/pylint.config.py

@@ -0,0 +1,25 @@
+# Copyright 2017 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""This module is used to configure gcp-devrel-py-tools run-pylint."""
+
+# Library configuration
+
+# library_additions = {}
+# library_replacements = {}
+
+# Test configuration
+
+# test_additions = copy.deepcopy(library_additions)
+# test_replacements = copy.deepcopy(library_replacements)