[pve-devel] seem than ifupdown2 is installed by default on upgrade (a friend reported me an ipv6 slaac bug)

[DERUMIER, Alexandre]

>>
>>But here, the non working setup is mixing "inet dhcp" + "inet6 auto"
>>
>>
>>"
>>auto vmbr2
>>iface vmbr2 inet dhcp
>>       bridge-ports eth0
>>       bridge-stp off
>>       bridge-fd 0
>>
>>iface vmbr2 inet6 auto

>>"

Ok, I found the bug, this is because ifupdown2 only allow 1 method for
the interface, even if it's ipv4 vs ipv6)

https://github.com/CumulusNetworks/ifupdown2/issues/174


I have look at it and I have a working patch to fix this.
I just need to polish it a little bit, I'll send try to send it next
week.