VDC first version

[robvanmieghem]

First version of the vdc flow as described in https://github.com/threefoldtech/3bot/blob/development_integration/vdc/concept.md

• [ ] tfgrid action 3script executor
  • [x] #193
  • [x] #190
• [x] #196
• [ ] #197
• [x] #194
• [x] #198
• [x] #199