- Remove any FlexRAN code
- Cleanup config files
- Remove LFDS7, libyaml dependencies

- AssertFatal() in nr_rlc_srb0_recv_sdu() if the srb0 is not found
- do_RRCSetup() may return -1, handle it properly
- do_RRCReject() may return -1, handle it properly
- remove one switch in rrc_gNB_generate_RRCReject()

If we do not stop RF after all threads, it can happen that the RF is
finished, but another thread of the RU (e.g., reorder thread) tries to
send out a package to the RF. This can lead to a segfault, as observed
in UHD, because we free all resources before reusing them.

This commit fixes this behavior.

Using Accelleran CU, the DRB ID is 4 (not 1), we need to set and access
the array 'drb_priority' correctly in the DU specific functions.

Before this commit, we had the following error:
[NR_MAC]   ASN1 message CellGroupConfig encoding failed (rlc-BearerToAddModList, 18446744073709551615)!

- Refactor iperf analysis into IperfAnalyze function
- IperfAnalyze uses server report, or uses last client report (for MBMS
  case)
- Additional check: duration as recognized in server/client report is
  according to command line

integration_2022_wk47

See merge request oai/openairinterface5g!1832

!1824 NR msg4 retransmission fix
!1827 Print ASN1 messages to console only if DEBUG_ASN1 flag is enabled
!1794 Replace gaussdouble() by gaussZiggurat()
!1829 bugfix in SRS configuration
!1830 Fix infinite loop in ULSCH scheduler when scheduling for multiple UEs
!1821 Send RRCReconfiguration when RA with Msg3 through DCCH also when the UE is in the InitialBWP (review pending)
!1797 NR UE move ULSCH PHY memory to stack
!1792 NR SA Tutorials v5
!1826 Update docker documentation
!1825 Fixes to improve CI