FakeLoopingCall raises IOError

All unittests using FakeLoopingCall raise an IOError if an initial
delay is not specified, because the default initial_dealy is -1.
Changing the default initial delay to 0.

story: 2005112
task: 29748
Change-Id: I6cbae0996c2347e25d8be617e4b3fd93f4d9cc95

magnum/tests/fakes.py

@@ -110,10 +110,10 @@ class FakeLoopingCall(object):
         self.call_func = func
 
     def start(self, interval, **kwargs):
-        intitial_delay = kwargs.pop("initial_delay", -1)
+        initial_delay = kwargs.pop("initial_delay", 0)
         stop_on_exception = kwargs.pop("stop_on_exception", True)
-        if intitial_delay:
-            time.sleep(intitial_delay)
+        if initial_delay:
+            time.sleep(initial_delay)
         while True:
             try:
                 self.call_func()