- this is needed because in the current implementation of the gNB
  the scrambling rnti is 0 for the RA and dci rnti otherwise

- monitoring RA window
- taking RA_offset into account
- workaround to generate PRACH only when the RAR has not been received yet (RA is idle)

- the commit fixes also the selection of the thread_id in TX procedures
- DCI configuration is currently limited to slot 1 and 7

- including temporary hotfix for the polar rnti

also use the high 6 bits from MIB when calculating decoded_frame_rx after the initial synchronization

Conflicts:
	executables/nr-ue.c
	openair1/PHY/NR_TRANSPORT/nr_dci_tools.c
	openair1/PHY/NR_UE_TRANSPORT/nr_prach.c
	openair1/PHY/defs_RU.h
	openair1/SCHED_NR_UE/phy_procedures_nr_ue.c
	openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_primitives.c
	openair2/RRC/NR/rrc_gNB_nsa.c
	openair2/X2AP/x2ap_eNB_handler.c

Develop Integration Branch -- 2020 week 17

See merge request oai/openairinterface5g!809

  - By default this value is equal to 0 at gNB in case of ulsim, but
    has a value in case of RF simulator
  - The N_TA_offset was calculated but not used at UE side

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  - The number of nb_dmrs_re at gNB side was set to 6, but here it is assumed
    that there will be no data allocation in OFDM symbols that carry DMRS
  - nb_dmrs_re that is being given as an input to the TBS calculation,
    should be multiplied by the number of DMRS symbols in order to get the total
    number of DMRS REs per RB
  - In the calculation of G, only the number of DMRS per RB in 1 OFDM symbol should
    be given as an input, because inside the function of the G calculation, this
    number is being multiplied by the number of OFDM symbols that carry DMRS

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

	Now is aligned with RMSIMULATOR config file (this should solve CI issues with monolithic tests)

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Merge remote-tracking branch 'origin/develop_integration_2020_w15' into develop_integration_2020_w17