involve watchdog to handle policy files instead of using cache

Registered by Eli Qiao

involve watchdog to watch policy files, this will stop polling policy and put them into cache.
any changes can be handle by watchdog.

for watchdog refer
http://pythonhosted.org/watchdog/_modules/watchdog/events.html#FileSystemEventHandler.on_modified

Blueprint information

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Priority:
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Drafter:
Eli Qiao
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Definition:
New
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