[rennes][roazhon3] minimal configuration

[roazhon3] Add BMC mac address

[roazhon3] Add mac address

[roazhon3] Add dick path

[roazhon3] add interfaces in net_names_mapping

[roazhon3] Modify disk path

[roazhon3] Add .json

[roazhon3] Change Disk path

[roazhon3] Fix the disk path

[roazhon3] Add g5k-checks infomations

[rennes] Add new cluster roazhon3