Add --output option to Swarming client and pass it through to the bot

appengine/swarming/local_smoke_test.py

 #!/usr/bin/env python
 # Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 """Integration test for the Swarming server, Swarming bot and Swarming client.
 
 It starts both a Swarming server and a Swarming bot and triggers tasks with the
 Swarming client to ensure the system works end to end.
 """
@@ skipping 496 matching lines @@
           u'initial_number_items': u'0',
           u'initial_size': u'0',
           u'items_cold': [11, 199],
           u'items_hot': [],
         },
         u'isolated_upload': {
           u'items_cold': [],
           u'items_hot': [],
         },
       },
-      properties_hash = u'f5ce2aa67d68519e3013f40869806046a0266f1a',
+      properties_hash = u'dc5ba0b5f15b179cb004994a6dcc1e9b728d4346',
     )
     task_id = self._run_isolated(
         hello_world, 'idempotent_reuse', ['--idempotent'], expected_summary, {})
     expected_summary[u'costs_usd'] = None
     expected_summary.pop('performance_stats')
     expected_summary[u'cost_saved_usd'] = 0.02
     expected_summary[u'deduped_from'] = task_id[:-1] + '1'
     expected_summary[u'try_number'] = 0
     expected_summary[u'properties_hash'] = None
     self._run_isolated(
@@ skipping 162 matching lines @@
     if bot is not None and bot.poll() is None:
       bot.kill()
       bot.wait()
   finally:
     cleanup(bot, client, servers, failed or verbose, leak)
   return int(failed)
 
 
 if __name__ == '__main__':
   sys.exit(main())