When using guestfwd=, Qemu only connects the virtual server's TCP port
to a single chardev. This is useless in most cases, as we usually want
to have more than a single connection from the guest to the outside world.

This patch adds a new cmd: target to guestfwd= that allows for execution
of a command on every TCP connection. This leverages the same code as
the -smb parameter, just that here the command is user defined.
Reported-by: NSascha Wilde <wilde@intevation.de>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>