Implement region abstraction
This MR add model and CRUD for Region abstraction. Hypervisors are now assigned to regions. Launching machines in regions rather than hypervisors directly will arrive in follow up MR.
Edited by Mateusz Kwiatkowski
This MR add model and CRUD for Region abstraction. Hypervisors are now assigned to regions. Launching machines in regions rather than hypervisors directly will arrive in follow up MR.