Name all subsystem reference consistently with an '_api' postfix and
clean up naming and folder structure in some cases.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Do not always print general help for ping cmd. Only if user supplies
'-h' or '--help' command, print information about the parameters.
After this the generated HTML documentation looks better for the
ping command.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
