the priority now is monolitic. this should we reverted and fixed properly once we have a working code in monolitic

A second thread message is created for L1 tx processing and pushed into the threaPool.
The message contain the nfapi rel15 PDUs for SSB, PDCCH and PDSCH. The memory of these PDUs are reused for subsequent slots.
Need to fix the nfapi mode VNF PNF implementation to adapt to this memory scheme.

MR !1188 : NR_gNB_initial_MIB_fix  
This MR fixes a bug for which the gNB would send an empty MIB in the first frames of execution. This is because MIB is generated every 8 frames but the first MIB wouldn't be generated before frame 8 at the beginning of each run.

MR !1184 : x2_handle_sctp_shutdown
Avoid eNB exiting after gNB tries to reconnect over X2 for NSA

Merge branch 'develop' of gitlab.eurecom.fr:oai/openairinterface5g into x2_handle_sctp_shutdown

Initial implementation of NR5G Standalone Access Registration procedures with CN5G.

Integration 2021 wk25

MR !1187 : improve UE module control
* improve UE module control
* make Qlog generation optional
* add nsa tests
* update jenkins pipeline

This reverts commit 0cd35686

Merge remote-tracking branch 'origin/develop-NR_SA_F1AP_5GRECORDS' into develop-NR_SA_F1AP_5GRECORDS