[pve-devel] Add support for external graphite metric server

[Alexandre Derumier]

Hi, this patches serie add support to send stats metric to an external graphite server.

Proxmox rrds are cool, but it's difficult to do stats accross vms.
For example : create a graphs with the total iops of all vms and compare them to storage stats.

(they are very nice graphite gui like www.granafa.org)

This patch series also add all stats for vm disks,nics when vm_status is called in full mode.
They are not streamed through corosync, I'm only sending them to graphite.