rpio: Add RDEPENDS For python-logging & python-threading
rpio: Add RDEPENDS For python-logging & python-threading

[GitHub Ticket #98 - rpio requires the logging and threading Python
packages but does not RDEPENDS them in recipie]

The rpio tool needs the Python logging and threading pacakges installed
on the target system for it to work.  The pacakges are not included when
doing a rpi-basci-image.  This change updates the recipe so that all the
required dependencies of the prio script are identified by the recipie.

Fixes #98

Signed-off-by: Thomas A F Thorne <3857bccc88203a3a5096056ecf8a6f860bf50edf@GoogleMail.com>

agherzan/meta-raspberrypi,d21d3q/meta-raspberrypi,d21d3q/meta-raspberrypi,agherzan/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi,d21d3q/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,d21d3q/meta-raspberrypi,kraj/meta-raspberrypi,schnitzeltony/meta-raspberrypi,kraj/meta-raspberrypi,leon-anavi/meta-raspberrypi,agherzan/meta-raspberrypi,leon-anavi/meta-raspberrypi,kraj/meta-raspberrypi,agherzan/meta-raspberrypi,schnitzeltony/meta-raspberrypi