assertIsNone used in a few client tests, fail on lucid

[David Britton]

<<< landscape.monitor.tests.test_plugin.MonitorPluginTest.test_resynchronize_with_global_scope
Stack Trace

_StringException: Text attachment: traceback
------------
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 134, in maybeDeferred
    result = f(*args, **kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/utils.py", line 191, in runWithWarningsSuppressed
    result = f(*a, **kw)
  File "/mnt/jenkins/workspace/landscape-client-test/label/lucid-client/landscape/tests/mocker.py", line 146, in test_method_wrapper
    result = test_method()
  File "/mnt/jenkins/workspace/landscape-client-test/label/lucid-client/landscape/monitor/tests/test_plugin.py", line 79, in test_resynchronize_with_global_scope
    self.assertIsNone(self.monitor.persist.get("wubble"))
AttributeError: 'MonitorPluginTest' object has no attribute 'assertIsNone'
------------

0.19 sec 1
<<< landscape.monitor.tests.test_plugin.MonitorPluginTest.test_resynchronize_with_provided_scope
Stack Trace

_StringException: Text attachment: traceback
------------
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 134, in maybeDeferred
    result = f(*args, **kw)
  File "/usr/lib/python2.6/dist-packages/twisted/internet/utils.py", line 191, in runWithWarningsSuppressed
    result = f(*a, **kw)
  File "/mnt/jenkins/workspace/landscape-client-test/label/lucid-client/landscape/tests/mocker.py", line 146, in test_method_wrapper
    result = test_method()
  File "/mnt/jenkins/workspace/landscape-client-test/label/lucid-client/landscape/monitor/tests/test_plugin.py", line 93, in test_resynchronize_with_provided_scope
    self.assertIsNone(self.monitor.persist.get("wubble"))
AttributeError: 'MonitorPluginTest' object has no attribute 'assertIsNone'
------------

0 ms 1
<<< landscape.package.tests.test_changer.AptPackageChangerTest.test_run_gets_session_id
Stack Trace

_StringException: Text attachment: traceback
------------
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 551, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/mnt/jenkins/workspace/landscape-client-test/label/lucid-client/landscape/package/tests/test_changer.py", line 1497, in assert_session_id
    self.assertIsNotNone(self.changer._session_id)
AttributeError: 'AptPackageChangerTest' object has no attribute 'assertIsNotNone'

https://ci.landscape.canonical.com/view/Landscape%20Client/job/landscape-client-test/label=lucid-client/286/