improvments to systemd/fedora 18 support

This branch contains fixes found while investigating integration of cloud-init
into oVirt. They're in 3 categories:
 - compatibility with systemd configuration management (as used in Fedora 18)
 - workaround for a 2.6 kernel quirk which prevented 'blkid' from displaying
   /dev/sr0 in some cases
 - writing sysconfig files in typical convention, with a newline preceding EOF,
   to make some parsers happy

1 files changed, 3 insertions, 2 deletions

diff --git a/tests/unittests/test_datasource/test_configdrive.py b/tests/unittests/test_datasource/test_configdrive.py
index 930086db..d5935294 100644
--- a/tests/unittests/test_datasource/test_configdrive.py
+++ b/tests/unittests/test_datasource/test_configdrive.py
@@ -259,8 +259,9 @@ class TestConfigDriveDataSource(MockerTestCase):
     def test_find_candidates(self):
         devs_with_answers = {}
 
-        def my_devs_with(criteria):
-            return devs_with_answers[criteria]
+        def my_devs_with(*args, **kwargs):
+            criteria = args[0] if len(args) else kwargs.pop('criteria', None)
+            return devs_with_answers.get(criteria, [])
 
         def my_is_partition(dev):
             return dev[-1] in "0123456789" and not dev.startswith("sr")