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, 6 insertions, 0 deletions

diff --git a/tests/cloud_tests/__init__.py b/tests/cloud_tests/__init__.py
index 98c1d6c7..dd436989 100644
--- a/tests/cloud_tests/__init__.py
+++ b/tests/cloud_tests/__init__.py
@@ -10,6 +10,12 @@ TESTCASES_DIR = os.path.join(BASE_DIR, 'testcases')
 TEST_CONF_DIR = os.path.join(BASE_DIR, 'testcases')
 TREE_BASE = os.sep.join(BASE_DIR.split(os.sep)[:-2])
 
+# This domain contains reverse lookups for hostnames that are used.
+# The primary reason is so sudo will return quickly when it attempts
+# to look up the hostname.  i9n is just short for 'integration'.
+# see also bug 1730744 for why we had to do this.
+CI_DOMAIN = "i9n.cloud-init.io"
+
 
 def _initialize_logging():
     """Configure logging for cloud_tests."""