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, 3 insertions, 3 deletions

diff --git a/tests/cloud_tests/collect.py b/tests/cloud_tests/collect.py
index db5ee99f..4805cea1 100644
--- a/tests/cloud_tests/collect.py
+++ b/tests/cloud_tests/collect.py
@@ -64,9 +64,9 @@ def collect_test_data(args, snapshot, os_name, test_name):
     # skip the testcase with a warning
     req_features = test_config.get('required_features', [])
     if any(feature not in snapshot.features for feature in req_features):
-        LOG.warn('test config %s requires features not supported by image, '
-                 'skipping.\nrequired features: %s\nsupported features: %s',
-                 test_name, req_features, snapshot.features)
+        LOG.warning('test config %s requires features not supported by image, '
+                    'skipping.\nrequired features: %s\nsupported features: %s',
+                    test_name, req_features, snapshot.features)
         return ({}, 0)
 
     # if there are user data overrides required for this test case, apply them