Integration Testing: tox env, pyxld 2.2.3, and revamp framework

Massive update to clean up and greatly enhance the integration testing
framework developed by Wesley Wiedenmeier.

 - Updated tox environment to run integration test 'citest' to utilize
   pylxd 2.2.3
 - Add support for distro feature flags
   - add framework for feature flags to release config with feature groups
     and overrides allowed in any release conf override level
   - add support for feature flags in platform and config handling
   - during collect, skip testcases that require features not supported by
     the image with a warning message
 - Enable additional distros (i.e. centos, debian)
 - Add 'bddeb' command to build a deb from the current working tree
   cleanly in a container, so deps do not have to be installed on host
 - Adds a command line option '--preserve-data' that ensures that
   collected data will be left after tests run. This also allows the
   directory to store collected data in during the run command to be
   specified using '--data-dir'.
 - Updated Read the Docs testing page and doc strings for pep 257
   compliance

1 files changed, 4 insertions, 3 deletions

diff --git a/tests/cloud_tests/__init__.py b/tests/cloud_tests/__init__.py
index 099c357f..07148c12 100644
--- a/tests/cloud_tests/__init__.py
+++ b/tests/cloud_tests/__init__.py
@@ -1,17 +1,18 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 
+"""Main init."""
+
 import logging
 import os
 
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 TESTCASES_DIR = os.path.join(BASE_DIR, 'testcases')
 TEST_CONF_DIR = os.path.join(BASE_DIR, 'configs')
+TREE_BASE = os.sep.join(BASE_DIR.split(os.sep)[:-2])
 
 
 def _initialize_logging():
-    """
-    configure logging for cloud_tests
-    """
+    """Configure logging for cloud_tests."""
     logger = logging.getLogger(__name__)
     logger.setLevel(logging.DEBUG)
     formatter = logging.Formatter(