Previously, wifi-enabled samples were not built by sanitycheck for the
cc3220sf_launchxl.
This patch gets the sockets echo sample to build.
Signed-off-by: Gil Pitney <gil.pitney@linaro.org>
It's expected that there will be few socket-based samples, so move
tehm under samples/sockets/ to not clutter the main dir.
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>