Convert Vagrant extensions to plugin

[gusztavvargadr]

• [ ] Instead of the local import, distribute as proper plugin.
• [ ] Samples
• [ ] Boxes
• [ ] Components
• [ ] require vagrant version and plugins in root config call
• [ ] Stages simplify (include reload)
• [ ] Support multiple load folders
• [ ] Todo support ruby blocks to customze
• [ ] core and os merge