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