Fix S3 feature flag publishing to S3 even if the intraday.s3.enabled: False and fetch -U 0 is used

[jay-johnson]

Engine logs before PR #349 showing the timeout and the jobs taking >30 seconds to finish

2019-03-01 02:01:19,220 - celery.worker.strategy - INFO - Received task: ae.work_tasks.get_new_pricing_data.get_new_pricing_data[0c8d4817-c84a-4dff-8550-724083d216f6]  
2019-03-01 02:01:24,347 - celery.worker.strategy - INFO - Received task: ae.work_tasks.get_new_pricing_data.get_new_pricing_data[eb2e14bb-e8d5-4af2-b715-b0ce708278d7]  
2019-03-01 02:01:36,947 - ae.work_tasks.publish_pricing_update - ERROR - ticker=XLF-tdcalls failed uploading bucket=backtest key=XLF_2019-02-28_tdcalls ex=Could not connect to the endpoint URL: "http://0.0.0.0:9000/backtest/XLF_2019-02-28_tdcalls"
2019-03-01 02:01:45,095 - ae.work_tasks.publish_pricing_update - ERROR - ticker=XLP-tdcalls failed uploading bucket=backtest key=XLP_2019-02-28_tdcalls ex=Could not connect to the endpoint URL: "http://0.0.0.0:9000/backtest/XLP_2019-02-28_tdcalls"
2019-03-01 02:01:52,414 - ae.work_tasks.publish_pricing_update - ERROR - ticker=XLF-tdputs failed uploading bucket=backtest key=XLF_2019-02-28_tdputs ex=Could not connect to the endpoint URL: "http://0.0.0.0:9000/backtest/XLF_2019-02-28_tdputs"

2019-03-01 02:01:52,455 - celery.app.trace - INFO - Task ae.work_tasks.get_new_pricing_data.get_new_pricing_data[0c8d4817-c84a-4dff-8550-724083d216f6] succeeded in 33.23137504400802s: None
2019-03-01 02:02:02,134 - ae.work_tasks.publish_pricing_update - ERROR - ticker=XLP-tdputs failed uploading bucket=backtest key=XLP_2019-02-28_tdputs ex=Could not connect to the endpoint URL: "http://0.0.0.0:9000/backtest/XLP_2019-02-28_tdputs"
2019-03-01 02:02:02,179 - ae.work_tasks.custom_task - INFO - on_success label=[ticker=XLP] - task_id=eb2e14bb-e8d5-4af2-b715-b0ce708278d7
2019-03-01 02:02:02,179 - celery.app.trace - INFO - Task ae.work_tasks.get_new_pricing_data.get_new_pricing_data[eb2e14bb-e8d5-4af2-b715-b0ce708278d7] succeeded in 37.829348045022925s: None