Changes so translation of remote address to the host's ip address in
the virtual network happens for all addresses in the 127.0.0.0/8
network, not just 127.0.0.1.

This fixes so that hostfwd bound to addresses such as 127.0.0.2 works.
Signed-off-by: NAnders Waldenborg <anders@0x63.nu>
Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com>