Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_F1C_F1U_extensions

Configure PDCP entity for UE DRB with no integrity and ciphering to comply with configuration at gNB

-To be revisited if we want to enable integrity and ciphering for DRBs

dirty fixes that fix the UL malformed packets (detected in wireshark), and also internally memory corrpution

- Encoding of UE Context Setup Request is failing. Problem seems to be with SST encoding

add DLinformationTransfer in nrUE, process SRB!=1 in UE (instead of discard), change struct member pdusession into pduSession to increase code readability (another struct contains also pdusession in lower case)

Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_SA_F1AP_5GRECORDS-USIM

Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_SA_F1AP_5GRECORDS-USIM

Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_SA_F1AP_5GRECORDS

testing with 2x2 and 4x4 with N310, small modifications in nr_ru_procedures and usrp_lib.cpp for multiple antennas

Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_SA_F1AP_5GRECORDS

Merge branch 'NR_SA_F1AP_5GRECORDS' of https://gitlab.eurecom.fr/oai/openairinterface5g into NR_SA_F1AP_5GRECORDS

Conflicts:
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c

Enable IP TUN interface configuration upon reception of PDU Session Establishment Accept NAS message

-User plane traffic validation with OAI UE and OAI CN:

-Downlink ping initiated from the CN is received at the IP interface of the UE. However it seems that there is some packet corruption preventing the generaration of ping reply.

-Uplink ping initiated from the UE reaches the OAI CN machine. However no ping reply is seen yet either.