dhcp: remove superfluous comment

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
dhcp: Configure the IP settings only after the dhcp server committed them.

The new behavior wait for the DHCP_ACK to be received by OSv to configure the
network parameters.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>
dhcp: handle DHCP_MT_NAK packets by restarting the DHCP configuration

Follow section 3.1.5 of RFC2131.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Avi Kivity <avi@cloudius-systems.com>