Merge Arm64 work in master

• a review of git diff arm64-puppet by @pneyron
• a review of git diff arm64-puppet by @snoir
• CI ok
• tests jenkins ok
  • env_generate_snapshot_debian9
  • env_generate_snapshot_debian10
  • env_generate_snapshot_other
  • env_test_snapshot_debian9
  • env_test_snapshot_debian10
  • env_test_snapshot_other
  • env_test_vm_snapshot_debian9
  • env_test_vm_snapshot_debian10
  • env_test_vm_snapshot_other