[luxembourg] Update references for granduc hardware
Done by cherry-pick and resetted to avoid 120s error.
Previous commits:
* [luxembourg] Update references for granduc hardware (mainly eth2 mac addresses)
* [luxembourg] Add some missing mac addresses, unfinished, not ready for generation
* [luxembourg] Initial commit for granduc
* [luxembourg] Initial commit for oar:generate
Signed-off-by:
Sebastien Varrette <Sebastien.Varrette@uni.lu>