Add private DHT for each cluster

[lthibault]

@mhchaudhry3 as promised, here's an easy issue to get started. Give me a shout if you need anything! 😃

• Start Here
  • Initialize the DHT with dual.New()
• Mark as complete when this code makes sense to you.

Bonus:

• Write a unit test that checks that Bootstrap is called.

[lthibault]

Implemented in #2. Kicking the unit test down the road.