manager: files watchdog for RPZ and some improvements

Improved files watchdog implementation now has two types of watched files:

• files that are reloaded by sending Lua command to all workers
• files that are reloaded by the resolver re-initialization (policy rules reload)

RPZ added to the files watchdog with /local-data/rpz/*/watchdog configurable option.

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• ee1faa48 - fixup! manager: files: watchdog: added RPZ files

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• f247df64 - manager: files: watchdog: added RPZ files
• 504e92ee - manager: added asyncio main loop to avoid Lock error
• 714a0700 - fixup! manager: files: watchdog: added RPZ files

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• 83b0c6f7 - manager: files: watchdog: added RPZ files
• 0d0ab8e7 - manager: added asyncio main loop to avoid Lock error

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• f167fadf - fixup! manager: added asyncio main loop to avoid Lock error

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• 24a63608 - fixup! fixup! manager: added asyncio main loop to avoid Lock error

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• fcfdf38b - manager: added asyncio main loop to avoid Lock error
• 260dff21 - python: unification of modules execution

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• 82e9f8b7 - fixup! python: unification of modules execution

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• 76992822 - fixup! manager: files: watchdog: added RPZ files

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• 8a484ca9 - fixup! fixup! manager: files: watchdog: added RPZ files

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• 84733d86 - fixup! fixup! fixup! manager: files: watchdog: added RPZ files

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marked this merge request as ready

requested review from @vcunat

I'm not sure about the way the reload of RPZ (policy rules) is triggered (API call /renew), but it seems to be working. I even managed to write a simple packaging test. I think it's right to do it through the API, as everything is already tested and ready there. I haven't even come up with another way, as it raises problems with asyncio event loop and its Lock in config_store. So when you have time @vcunat , please try to test it.