Expose some statistics from the simple scheduler, so that the status page does...

Expose some statistics from the simple scheduler, so that the status page does not break when it is enabled.

zoe_master/scheduler/simple_scheduler.py

@@ -123,5 +123,9 @@ class ZoeSimpleScheduler(ZoeBaseScheduler):
         """Scheduler statistics."""
         return {
             'queue_length': len(self.fifo_queue),
-            'termination_threads_count': len(self.async_threads)
+            'running_length': 0,
+            'termination_threads_count': len(self.async_threads),
+            'queue': [s.id for s in self.fifo_queue],
+            'running_queue': [],
+            'platform_stats': {}
         }