Milestone PrimoGENI: S2.e: PrimoGENI Aggregate 2.0 plan

PrimoGENI Aggregate 2.0 design and development plan.

Provide an implementation plan for PrimoGENI aggregate 2.0, with extended virtualization capabilities supporting multiple simultaneous large-scale high-fidelity network experiments, and necessary tools for streamlining experiment workflow (including configuring, deploying, monitoring and controlling network experiments).