[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 <TafThorne@GoogleMail.com>