[nancy][grvingt] fix inconsistency in network description

Le test kavlan ne fonctionne pas sur certains noeuds de grvingt lié à une incohérence de description entre le refrepo et le branchement physique.

requested review from @npaulin

approved this merge request

added 17 commits

• 6a5f5bfe...81e3f684 - 16 commits from branch master
• 61db84af - [nancy][grvingt] fix inconsistency in network description

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merged

mentioned in commit 1dd829a1