Master * nettest: fix typo! NET_LOOPBACK -> CONFIG_NET_LOOPBACK Signed-off-by: EunBong Song <eunb.song@samsung.com> * nettest: fix compilation error. Should enable NET_SETSOCKOPT for preventing compilation error. Signed-off-by: EunBong Song <eunb.song@samsung.com> Approved-by: GregoryN <gnutt@nuttx.org>