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, 4 insertions, 5 deletions

diff --git a/tests/cloud_tests/bddeb.py b/tests/cloud_tests/bddeb.py
index c259dfea..a6d5069f 100644
--- a/tests/cloud_tests/bddeb.py
+++ b/tests/cloud_tests/bddeb.py
@@ -8,8 +8,7 @@ import tempfile
 
 from cloudinit import util as c_util
 from tests.cloud_tests import (config, LOG)
-from tests.cloud_tests.platforms import (platforms, images, snapshots,
-                                         instances)
+from tests.cloud_tests import platforms
 from tests.cloud_tests.stage import (PlatformComponent, run_stage, run_single)
 
 pre_reqs = ['devscripts', 'equivs', 'git', 'tar']
@@ -85,18 +84,18 @@ def setup_build(args):
         # set up image
         LOG.info('acquiring image for os: %s', args.build_os)
         img_conf = config.load_os_config(platform.platform_name, args.build_os)
-        image_call = partial(images.get_image, platform, img_conf)
+        image_call = partial(platforms.get_image, platform, img_conf)
         with PlatformComponent(image_call) as image:
 
             # set up snapshot
-            snapshot_call = partial(snapshots.get_snapshot, image)
+            snapshot_call = partial(platforms.get_snapshot, image)
             with PlatformComponent(snapshot_call) as snapshot:
 
                 # create instance with cloud-config to set it up
                 LOG.info('creating instance to build deb in')
                 empty_cloud_config = "#cloud-config\n{}"
                 instance_call = partial(
-                    instances.get_instance, snapshot, empty_cloud_config,
+                    platforms.get_instance, snapshot, empty_cloud_config,
                     use_desc='build cloud-init deb')
                 with PlatformComponent(instance_call) as instance: