ntp: Add schema definition and passive schema validation.

cloud-config files are very flexible and permissive.
This adds a jsonsschema definition to the cc_ntp module and validation
functions in cloudinit/config/schema which will log warnings about
invalid configuration values in the ntp section.

A cmdline tools/cloudconfig-schema is added which can be used in our dev
environments to quickly attempt to exercise the ntp schema.
It is also exposed as a main in cloudinit.config.schema.
(python3 -m cloudinit.config.schema)

LP: #1692916

1 files changed, 1 insertions, 5 deletions

diff --git a/tests/unittests/helpers.py b/tests/unittests/helpers.py
index 9ff15993..e78abce2 100644
--- a/tests/unittests/helpers.py
+++ b/tests/unittests/helpers.py
@@ -19,10 +19,6 @@ try:
     from contextlib import ExitStack
 except ImportError:
     from contextlib2 import ExitStack
-try:
-    from cStringIO import StringIO
-except ImportError:
-    from io import StringIO
 
 from cloudinit import helpers as ch
 from cloudinit import util
@@ -102,7 +98,7 @@ class CiTestCase(TestCase):
         if self.with_logs:
             # Create a log handler so unit tests can search expected logs.
             logger = logging.getLogger()
-            self.logs = StringIO()
+            self.logs = six.StringIO()
             handler = logging.StreamHandler(self.logs)
             self.old_handlers = logger.handlers
             logger.handlers = [handler]