[Users] Multiple bridge support

[Dietmar Maurer]

Hi all,

In Proxmox VE we want to support multiple bridges. I currently use a
patch
which adds an bridge parameter to the netif options: 

NETIF="ifname=XXX,bridge=XXX,mac=XXX,host_ifname=XXX,host_mac=XXX"

--netif_add ifname[,mac,host_ifname,host_mac,bridge]

I also modified --netif_add to accept empty parameters, for example:

--netif_add eth3,,,,vmbr3

I wonder if we can include that into the vzctl release - I will post 
the patch if soembody is interested.

- Dietmar