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

2 files changed, 2 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())
 
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