Fix every class that should be abstract

Change-Id: I19d2738da067a0a36c3a81167f5df92de2f7d5b8

cloudbaseinit/metadata/services/base.py

@@ -19,6 +19,7 @@ import time
 
 from oslo_config import cfg
 from oslo_log import log as oslo_logging
+import six
 
 from cloudbaseinit.utils import encoding
 
@@ -60,6 +61,7 @@ class NotExistingMetadataException(Exception):
     pass
 
 
+@six.add_metaclass(abc.ABCMeta)
 class BaseMetadataService(object):
     def __init__(self):
         self._cache = {}

cloudbaseinit/metadata/services/osconfigdrive/base.py

@@ -14,7 +14,10 @@
 
 import abc
 
+import six
 
+
+@six.add_metaclass(abc.ABCMeta)
 class BaseConfigDriveManager(object):
 
     @abc.abstractmethod

cloudbaseinit/plugins/common/userdataplugins/base.py

@@ -14,7 +14,10 @@
 
 import abc
 
+import six
 
+
+@six.add_metaclass(abc.ABCMeta)
 class BaseUserDataPlugin(object):
 
     def __init__(self, mime_type):

cloudbaseinit/tests/metadata/services/test_baseopenstackservice.py

@@ -34,11 +34,17 @@ CONF = cfg.CONF
 MODPATH = "cloudbaseinit.metadata.services.baseopenstackservice"
 
 
+class FinalBaseOpenStackService(baseopenstackservice.BaseOpenStackService):
+
+    def _get_data(self):
+        pass
+
+
 class TestBaseOpenStackService(unittest.TestCase):
 
     def setUp(self):
         CONF.set_override("retry_count_interval", 0)
-        self._service = baseopenstackservice.BaseOpenStackService()
+        self._service = FinalBaseOpenStackService()
         date = "2013-04-04"
         fake_metadata = fake_json_response.get_fake_metadata_json(date)
         self._fake_network_config = fake_metadata["network_config"]