Add the service_state into test_schedule_happy_day.

Since the fake filter scheduler does not update the capabilities, the sevice
states remains empty. To avoid the None value for free_capacity_gb, we set the
host_manager to a fake host manager with a list of service states.

Fixed Bug 1171906.

Change-Id: I359ea6952392cc5e6b8eff513f3ca4d8161a30e3

cinder/tests/scheduler/test_filter_scheduler.py

@@ -96,6 +96,7 @@ def _fake_weigh_objects(_self, functions, hosts, options):
             return [weights.WeighedHost(host_state, self.next_weight)]
 
         sched = fakes.FakeFilterScheduler()
+        sched.host_manager = fakes.FakeHostManager()
         fake_context = context.RequestContext('user', 'project',
                                               is_admin=True)