Since commit 38986c14 (kmscube: add option to run for specified # of frames)
we have the option of running for a given number of frames. This allows
usage for instance in automatic system tests like climate chamber etc.
To allow starting in background without termination from STDIN add a
new option that prevents polling / selecting for console input.

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>