5G L2sim is broken since some time, and there is no time to fix it.
Remove it from the Container Parent Pipeline.

- Four mounting of files, we need the absolute path. Even if the script
  gets relative paths, realpath will give the absolute path
- Correctly recognize and handle gNB images with AW2S support

- this prevents pulling PDUs from PDCP when re-establishment is awaiting

- short and long SN sizes
- PDCP PDU header sizes
- PDCP integrity size
- getter for maximim PDCP PDU size

- no need to specify "single-ue" profile when running iperf test for 1 UE only
- default profile "balanced" can be used instead, computes BW for 1 UE correctly

- Remove IperfFromContainer
- Remove unused functions IperfExit and PingExit
- Remove unused function for iperf analysis

- add traffic servers
- add runServer parameter

On Wayland (e.g., Gnome on Ubuntu 22), additional steps might be
necessary to make QtScope run. Describe them in the doc.

Closes: #696

use layer number and not dmrs port number to index pusch channel estimates (plus some code improvement)

use layer number and not dmrs port number to index pdsch channel estimates (plus some code improvement)

38.473 section 8.2.3.1 says that upon F1 Setup Request, UE associated
signalling should be erased. In this commit, we trigger a release of all
UEs that were still connected to a DU when we received the SCTP
shutdown, i.e., when the DU disconnects.

Closes #762