Add a test case for DelayedControls that exercises the setting of
controls and reading back what controls were used for a particular
frame. Also exercise corner cases such as a V4L2 device that does not
reset its sequence number to 0 at stream on and sequence number wrapping
around the uint32_t value space.
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
