F1AP Enc/Dec Library follow-up

Follow-up after !2890

getopt() returns int

Bugfix in ue pusch mac pdu creation

When more than one sdu with equal priority is present, there could be
buffer left after serving the lcids and also not enough to equally serve
all lcids. This commit checks for this condition. Before this fix the ue
would send malformed mac pdus when serving multiple lcids.

See getopt(3): returns int, so store it in an int variable.
I went through all occurrences, project-wide. All return values of
getopt() should be stored in ints now.

Bugfix: Fill QFI for N3 GTP messages

fix nr rlc tests

in openair2/LAYER2/nr_rlc/tests:

    ./run_tests.sh

was failing.

process registration reject in UE

when the 5GC rejects the ue, the message was not processed (information
element not declared)
this MR process it to print it and stop the UE
a more complete code should be done when the UE will be able to select
another cells than the most powerful PBCH, but it require larger
enhancement

CI: Update RAN-gNB-N300-Timing-Phytest-LDPC test cases

- update enc/decoder tests in RAN-gNB-N300-Timing-Phytest-LDPC - test
  only for given SNR value (check of the test results to be added in the
  following MR)
- add cores to Tpool in the nr_dlsim test cases, currently we test with
  only one core
- always execute all the nr_ulsim/nr_dlsim tests, even if one of them
  fails
- add new nr_dlsim test cases - test with 4 antennas, 2 layers

Fix heap overflow in websrv

Refactor file descriptor handling in rfsimulator

- add hashtable iterator to hashtable.c
- use hashtable for file descriptor to buffer_t mapping in rfsimulator

This enables the use of file descriptors above 250. The linux file
descriptors can reach the value of FD_SETSIZE which could be e.g. 1024.
This is not an issue in most cases but if the UE or gNB process opens a
lot of file descriptors for other purposes we might see rfsimulator file
descriptors reach > 250 and cause a segfault.

Also added tests for new hashtable functions.

Instead of hardcoding to 0, instruct the GTP module to send N3 GTP
packets with the right GTP.

We currently only support one QoS Flow, so check that it is really only
one.

Use hashtable for determining which buffer_t does a sock map to. This
lifts the restriction for number of FDs used by applications using rfsimulator.

When more than one sdu with equal priority is present, there could be
buffer left after serving the lcids and also not enough for equaly
serving all lcids. This commit checks for this condition. Before this
fix the ue would send malformed mac pdus when serving multiple lcids.

in openair2/LAYER2/nr_rlc/tests:

    ./run_tests.sh

was failing.

CI: remove unused code, clean up imports

* Remove pyshark, matplotlib imports, as they are not used
* Remove stats_monitor.py, as the CI does not use it
* Clean up many warnings shown by pyflakes regarding includes that we don't use

pyflakes warns about various errors, addressed here. For cls_cluster.py,
remove (unknown) sys.exit and replace through Exception, as sys.exit()
has the unwanted effect that the CI script would stop.  Instead, raise
an Exception that would show the problem in the HTML, and ensures that
the script runs until the end.

These are the warnings flagged by pyflakes.

    cls_cluster.py:297:4: undefined name 'sys'

    cls_containerize.py:39:1: 'subprocess' imported but unused
    cls_containerize.py:41:1: 'threading' imported but unused
    cls_containerize.py:43:1: 'multiprocessing.Process' imported but unused
    cls_containerize.py:43:1: 'multiprocessing.Lock' imported but unused
    cls_containerize.py:43:1: 'multiprocessing.SimpleQueue' imported but unused
    cls_containerize.py:49:1: 'cls_cluster as OC' imported but unused
    cls_containerize.py:50:1: redefinition of unused 'cls_cmd' from line 42

    cls_module.py:28:1: 'os' imported but unused
    cls_module.py:29:1: 'sys' imported but unused
    cls_module.py:34:1: 'subprocess' imported but unused
    cls_module.py:35:1: 'datetime.datetime' imported but unused
    cls_module.py:211:11: undefined name 'sshconnection'

    cls_oaicitest.py:37:1: 'pexpect' imported but unused
    cls_oaicitest.py:47:1: 'cls_cluster as OC' imported but unused
    cls_oaicitest.py:54:1: 'matplotlib.pyplot as plt' imported but unused
    cls_oaicitest.py:55:1: 'numpy as np' imported but unused

    cls_oai_html.py:34:1: 'sys' imported but unused
    cls_oai_html.py:41:1: 'multiprocessing.Process' imported but unused
    cls_oai_html.py:41:1: 'multiprocessing.Lock' imported but unused
    cls_oai_html.py:41:1: 'multiprocessing.SimpleQueue' imported but unused

    cls_physim.py:37:1: 'multiprocessing.SimpleQueue' imported but unused

    cls_static_code_analysis.py:39:1: 'time' imported but unused
    cls_static_code_analysis.py:40:1: 'multiprocessing.Process' imported but unused
    cls_static_code_analysis.py:40:1: 'multiprocessing.Lock' imported but unused
    cls_static_code_analysis.py:40:1: 'multiprocessing.SimpleQueue' imported but unused

    epc.py:41:1: 'multiprocessing.Process' imported but unused
    epc.py:41:1: 'multiprocessing.Lock' imported but unused
    epc.py:41:1: 'multiprocessing.SimpleQueue' imported but unused

    main.py:60:1: 'pexpect' imported but unused
    main.py:66:1: 'datetime' imported but unused
    main.py:68:1: redefinition of unused 'subprocess' from line 63
    main.py:70:1: 'multiprocessing.Process' imported but unused
    main.py:70:1: 'multiprocessing.Lock' imported but unused
    main.py:70:1: 'multiprocessing.SimpleQueue' imported but unused

    provideUniqueImageTag.py:2:1: 'os' imported but unused

Integration: `2024.w42`

Closes #547, #853, #854, #858, #859, #862, #844, and #746

See merge request oai/openairinterface5g!3053

* !3047 Resolve compilation warnings on ARM
* !3052 Optimize T_ID() macro.
* !3045 CI: Reduce tested DL throughput on Aerial
* !3039 fix for Other SI reception when BWP start != 0
* !2997 websrv regression
* !3041 Update NR SA Tutorials
* !3042 Update TESTBenches.md to reflect current testbench
* !3004 Hotfix to remove an unwanted TX power reduction when using multiple TX antenna ports.
* reduce ssPBCH_BlockPower in gNB config of FHI7.2 pipeline
* !3046 A testsuite and a benchmark for RLC AM mode
* !3038 Various bugfixes for gNB stability, cleanup
* !3051 PUCCH2 DTX detection
* nr_psbchsim: fix segv by providing correct get_nrUE_params()
* !3049 Improve PUSCH and PUCCH SNR stability
* !3054 Allocate and add sD to DRB NSSAI in case sD != 0xffffff

Currently, sD has not been allocated, so the octet string is empty. Fix the
allocation to correctly write&read NSSAIs in UE context setup/modification
request messages.

Reset TPC to 0 dB, after sending it to the UE, to not request new gain multiple
times before computing new value for SNR.

When running, nr_psbchsim, we get this UBsan error:

    openair1/PHY/NR_UE_ESTIMATION/nr_adjust_synch_ue.c:79:16: runtime error: member access within misaligned address 0x0ff4278c791c for type 'struct nrUE_params_t', which requires 8 byte alignment

The problem is that the corresponding definition of
get_nrUE_params() in psbchsim.c does not actually return the UE params,
but void, so we might or might not get something that resembles valid
data in nr_adjust_synch_ue.c. Fix this by including nr-uesoftmodem.h
(that provides the correct declaration) and define it correctly. Due to
type mismatches, also adapt downlink_frequency, uplink_frequency_offset,
and openair_cfg (which might result in the same type of bugs).

This adds DTX detection in PUCCH 2 receiver. This is detected by MAC
already which will drop PUCCH 2 indications that are detected as DTX.
For the moment this uses the same pucch0_dtx_threshold value indicated
in L1 section of the configuration file. The feature firstly reduces
unnecessary logging on stdout and the use of invalid CSI measurements in
the MAC scheduler.

Closes: #547