Merge branch 'eventhubs_preview2' of https://github.com/Azure/azure-sdk-for-python into preview2

Author: yunhaoling

sdk/eventhub/azure-eventhubs/azure/eventhub/eventprocessor/event_processor.py

@@ -116,9 +116,6 @@ async def _start_claimed_partitions(self, claimed_partitions):
         try:
             await asyncio.gather(*self._tasks)
         finally:
-            # TODO: It's not agreed whether a partition manager has method close().
-            await self._partition_manager.close()
-            log.info("EventProcessor %r partition manager is closed", self._id)
             log.info("EventProcessor %r has stopped", self._id)