Add a method for WConfd context to GanetiContextMock

Signed-off-by: Petr Pudlak <pudlak@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

test/py/cmdlib/testsupport/cmdlib_testcase.py

@@ -57,6 +57,9 @@ class GanetiContextMock(object):
     self._test_case = test_case
     self.livelock = LiveLockMock()
 
+  def GetWConfdContext(self, _ec_id):
+    return (None, None, None)
+
   def AddNode(self, node, ec_id):
     self._test_case.cfg.AddNode(node, ec_id)