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, 6 insertions, 6 deletions

diff --git a/tests/cloud_tests/testcases/modules/write_files.py b/tests/cloud_tests/testcases/modules/write_files.py
index 97dfeec3..7bd520f6 100644
--- a/tests/cloud_tests/testcases/modules/write_files.py
+++ b/tests/cloud_tests/testcases/modules/write_files.py
@@ -1,29 +1,29 @@
 # 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 TestWriteFiles(base.CloudTestCase):
-    """Example cloud-config test"""
+    """Example cloud-config test."""
 
     def test_b64(self):
-        """Test b64 encoded file reads as ascii"""
+        """Test b64 encoded file reads as ascii."""
         out = self.get_data_file('file_b64')
         self.assertIn('ASCII text', out)
 
     def test_binary(self):
-        """Test binary file reads as executable"""
+        """Test binary file reads as executable."""
         out = self.get_data_file('file_binary')
         self.assertIn('ELF 64-bit LSB executable, x86-64, version 1', out)
 
     def test_gzip(self):
-        """Test gzip file shows up as a shell script"""
+        """Test gzip file shows up as a shell script."""
         out = self.get_data_file('file_gzip')
         self.assertIn('POSIX shell script, ASCII text executable', out)
 
     def test_text(self):
-        """Test text shows up as ASCII text"""
+        """Test text shows up as ASCII text."""
         out = self.get_data_file('file_text')
         self.assertIn('ASCII text', out)