[data] Slightly adjustement for 2.70a

Some boxes seems to move a bit in 2.70a, so lower them from a few
centimeter. Fix laser and camera unit-test for 2.70a
[builder] Generate only useful config in multinode situation

In multinode situation, we do not want to create streams and other stuff
for robot simulated on other node. In some case, the initialisation of
streams and co have some unwanted side effects...

It should fix issue reported by Simon in private mails
[bin/morse.in] Blender 2.70a seems ok for blender