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: 78c7a82a2e3214eaec3c559269e3cc6c219759c0)
Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>