pylint: Update pylint to 1.7.1, run on tests/ and tools and fix complaints.

The motivation for this is that
 a.) 1.7.1 runs with python 3.6 (bionic)
 b.) we want to run pylint on tests/ and tools for the same reasons
     that we want to run it on cloudinit/

The changes are described below.
- Update tox.ini to invoke pylint v1.7.1.
- Modify .pylintrc generated-members ignore mocked object members (m_.*)
- Replace "dangerous" params defaulting to {}
- Fix up cloud_tests use of platforms
- Cast some instance objects to with dict()
- Handle python2.7 vs 3+ ConfigParser use of readfp (deprecated)
- Update use of assertEqual(<boolean>, value) to assert<Boolean>(value)
- replace depricated assertRegexp -> assertRegex
- Remove useless test-class calls to super class
- Assign class property accessors a result and use it
- Fix missing class member in CepkoResultTests
- Fix Cheetah test import

3 files changed, 37 insertions, 2 deletions

diff --git a/cloudinit/cmd/tests/test_clean.py b/cloudinit/cmd/tests/test_clean.py
index af438aab..1379740b 100644
--- a/cloudinit/cmd/tests/test_clean.py
+++ b/cloudinit/cmd/tests/test_clean.py
@@ -151,7 +151,7 @@ class TestClean(CiTestCase):
                  'sys.argv': {'new': ['clean', '--logs']}},
                 clean.main)
 
-        self.assertEqual(0, context_manager.exception.code)
+        self.assertRaisesCodeEqual(0, context_manager.exception.code)
         self.assertFalse(
             os.path.exists(self.log1), 'Unexpected log {0}'.format(self.log1))
 
diff --git a/cloudinit/cmd/tests/test_status.py b/cloudinit/cmd/tests/test_status.py
index 8ec9b5bc..6d4a11e8 100644
--- a/cloudinit/cmd/tests/test_status.py
+++ b/cloudinit/cmd/tests/test_status.py
@@ -347,7 +347,7 @@ class TestStatus(CiTestCase):
                      '_is_cloudinit_disabled': (False, ''),
                      'Init': {'side_effect': self.init_class}},
                     status.main)
-        self.assertEqual(0, context_manager.exception.code)
+        self.assertRaisesCodeEqual(0, context_manager.exception.code)
         self.assertEqual('status: running\n', m_stdout.getvalue())
 
 # vi: ts=4 expandtab syntax=python
diff --git a/cloudinit/tests/helpers.py b/cloudinit/tests/helpers.py
index feb884ab..0080c729 100644
--- a/cloudinit/tests/helpers.py
+++ b/cloudinit/tests/helpers.py
@@ -19,6 +19,11 @@ try:
 except ImportError:
     from contextlib2 import ExitStack
 
+try:
+    from configparser import ConfigParser
+except ImportError:
+    from ConfigParser import ConfigParser
+
 from cloudinit import helpers as ch
 from cloudinit import util
 
@@ -113,6 +118,16 @@ class TestCase(unittest2.TestCase):
         self.addCleanup(m.stop)
         setattr(self, attr, p)
 
+    # prefer python3 read_file over readfp but allow fallback
+    def parse_and_read(self, contents):
+        parser = ConfigParser()
+        if hasattr(parser, 'read_file'):
+            parser.read_file(contents)
+        elif hasattr(parser, 'readfp'):
+            # pylint: disable=W1505
+            parser.readfp(contents)
+        return parser
+
 
 class CiTestCase(TestCase):
     """This is the preferred test case base class unless user
@@ -158,6 +173,18 @@ class CiTestCase(TestCase):
             dir = self.tmp_dir()
         return os.path.normpath(os.path.abspath(os.path.join(dir, path)))
 
+    def assertRaisesCodeEqual(self, expected, found):
+        """Handle centos6 having different context manager for assertRaises.
+            with assertRaises(Exception) as e:
+                raise Exception("BOO")
+
+            centos6 will have e.exception as an integer.
+            anything nwere will have it as something with a '.code'"""
+        if isinstance(found, int):
+            self.assertEqual(expected, found)
+        else:
+            self.assertEqual(expected, found.code)
+
 
 class ResourceUsingTestCase(CiTestCase):
 
@@ -395,4 +422,12 @@ if not hasattr(mock.Mock, 'assert_not_called'):
     mock.Mock.assert_not_called = __mock_assert_not_called
 
 
+# older unittest2.TestCase (centos6) do not have assertRaisesRegex
+# And setting assertRaisesRegex to assertRaisesRegexp causes
+# https://github.com/PyCQA/pylint/issues/1653 . So the workaround.
+if not hasattr(unittest2.TestCase, 'assertRaisesRegex'):
+    def _tricky(*args, **kwargs):
+        return unittest2.TestCase.assertRaisesRegexp
+    unittest2.TestCase.assertRaisesRegex = _tricky
+
 # vi: ts=4 expandtab