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

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/unittests/test_cs_util.py b/tests/unittests/test_cs_util.py
index ee88520d..2a1095b9 100644
--- a/tests/unittests/test_cs_util.py
+++ b/tests/unittests/test_cs_util.py
@@ -35,6 +35,7 @@ class CepkoMock(Cepko):
 # touched the underlying Cepko class methods.
 class CepkoResultTests(test_helpers.TestCase):
     def setUp(self):
+        self.c = Cepko()
         raise test_helpers.SkipTest('This test is completely useless')
 
     def test_getitem(self):