[RFE] Multi-host support

[hgeaydem]

This enhancement would allow to provide more flexibility. As such it should stay infrastructure-provider independant as much as possible and should allow to use VMs as cluster node on all hosts

Current challenges :

• [Virt] Figuring out the network setup between nodes to allow deploy and clusters setup
• [Virt] Figuring out the most adequate deploy method (pxe, vmedia ...)
• [Ansible] Figuring out multiple hosts handling + implementation