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, 7 insertions, 16 deletions

diff --git a/tests/cloud_tests/testcases/modules/final_message.py b/tests/cloud_tests/testcases/modules/final_message.py
index b06ad01b..b7b5d5e0 100644
--- a/tests/cloud_tests/testcases/modules/final_message.py
+++ b/tests/cloud_tests/testcases/modules/final_message.py
@@ -1,34 +1,27 @@
 # This file is part of cloud-init. See LICENSE file for license information.
 
-"""cloud-init Integration Test Verify Script"""
+"""cloud-init Integration Test Verify Script."""
 from tests.cloud_tests.testcases import base
 
 
 class TestFinalMessage(base.CloudTestCase):
-    """
-    test cloud init module `cc_final_message`
-    """
+    """Test cloud init module `cc_final_message`."""
+
     subs_char = '$'
 
     def get_final_message_config(self):
-        """
-        get config for final message
-        """
+        """Get config for final message."""
         self.assertIn('final_message', self.cloud_config)
         return self.cloud_config['final_message']
 
     def get_final_message(self):
-        """
-        get final message from log
-        """
+        """Get final message from log."""
         out = self.get_data_file('cloud-init-output.log')
         lines = len(self.get_final_message_config().splitlines())
         return '\n'.join(out.splitlines()[-1 * lines:])
 
     def test_final_message_string(self):
-        """
-        ensure final handles regular strings
-        """
+        """Ensure final handles regular strings."""
         for actual, config in zip(
                 self.get_final_message().splitlines(),
                 self.get_final_message_config().splitlines()):
@@ -36,9 +29,7 @@ class TestFinalMessage(base.CloudTestCase):
                 self.assertEqual(actual, config)
 
     def test_final_message_subs(self):
-        """
-        test variable substitution in final message
-        """
+        """Test variable substitution in final message."""
         # TODO: add verification of other substitutions
         patterns = {'$datasource': self.get_datasource()}
         for key, expected in patterns.items():