Re-commiting a change Pascal made and I reverted in commit 966be0e2. I shouldn't have.

Revert "[lille] Set enabled to true on mountable interfaces": we need to disable checks for enabled/mountable in g5k-check before

This reverts commit 0b925f52.

Revert "[luxembourg] Set enabled to true on mountable interfaces": we need to disable checks for enabled/mountable in g5k-check before

This reverts commit c3e79cfe.

Revert "[nancy] Add information for 2nd interface on griffon-[11-14]": we need to disable checks for enabled/mountable in g5k-check before

This reverts commit 8d0d0025.

[nancy] change mac addresss for graphene-28 (my mistake, re-doing emorel commit that I accidentally reverted)