should support for vagrant plugin config settings about dev HOT 5 CLOSED

this is not easy as I haven't figured out how to set plugin config dynamically.

The current WIP branch: https://github.com/hoatle/teracy-dev/tree/features/186-plugins-settings

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I've merged as incomplete implementation:

• use plugins config format

but temporarily use fixed plugin checking. Need to work on this to get it dynamic.

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related to #239

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new plugin config format from #239

  "plugins": [{
    "_id": "0",
    "name": "vagrant-gatling-rsync",
    "config_key": "gatling",
    "required": true,
    // auto rsync watch when up/ reload done
    // should try to reduce rsync latency to 0.5s instead of 1s #173
    "latency": 0.5, //0.5s
    "time_format": "%H:%M:%S",
    "rsync_on_startup": true
  }, {
    "_id": "1",
    "name": "vagrant-rsync-back",
    "required": true
  }]

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#246 should help to customize other vagrant plugins now, though, it's not the most convenient way (just json config is enough)

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