Handover scenarios

[louisroyer]

• Get the testbed working with 2 SR4MEC slices
  • Why is Free5GC's SMF sending (empty) Session Modification Request (and no Session Creation Request)? : this is what happens when in SMF's config, UPF's networkInstance != Dnn
• Fix issue with NextMN-Lite's gNB failure to dial SRGW
  • Bad check of number of layers in GTP4 packet (<4 instead of <3) => GTP Echo packet dropped
  • Use new version of Docker image
    • Add dockerfile / alpine
    • Update config and image in template/compose.yaml
• Update jinja script to copy image build context from a single place
• Configure latencies with tc + iptables: https://wiki.archlinux.org/title/Advanced_traffic_control#Using_tc_+_iptables
• Update binding scenario
  • Use nextmn/upf
  • Update srv6-ctrl to send only rules related to a specific slice
• Update migration scenario
  • Update miration script with new addresses
• Create handover scenarios

bonus step: Free5GC UPF no longer working locally (kernel update) -> fix this