Fix the IP masquerading settings so that networked QEMU sessions can
reach external networks.
This is a partial fix for [YOCTO #2329].
(From OE-Core rev: 14c4ce77b5c3738a8a9ea7d724de7ce9efff18c4)
Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>