- in phy-test both rnti are set to same rnti
- in do-ra the scrambling rnti is set to 0 while the polar rnti is the RA_rnti (computed as per
  TS 38.321)

- restructured nr_pdcch_unscrambling function
- minor cleanups
- formatting

- NR UE scheduled response for RA PDSCH case
- UE processing of RAR DCI
- some cleanup and formatting

NR fix downlink IP

See merge request oai/openairinterface5g!806

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

- this was necessary because as soon as the gNB starts, it tries detecting
  the prach preambles and it mesaures the background noise. However, there is
  a delay of several dozens of frames before it considers the preables as
  detected.
- the solution at the UE consists in avoiding sending preamble as soon as the
  UE syncs by introducing an offset, this keeps the power measurements low at
  gNB side as long as the preamble detection counter is under threshold

See merge request oai/openairinterface5g!804

Develop Integration Branch : 2020 week 15

The following Merge Requests have been included :

* MR 789 : fix sync source configuration for eNB and B200-mini
* MR 795 : dft/fft in shared lib
* MR 795 : NR gNB SCF indication
* MR 798 : Improvements on the "default" LTE-4G scheduler

ENDC S1-U gNB support: Separate some GTP functions between eNB and gNB. Downlink traffic from SGW arrives properly at gNB now after path switch

Merge remote-tracking branch 'origin/NR_RRCConfiguration_sync_source' into develop_integration_2020_w15_bis

Instead of looping over UEs and all DL config Req/HI DCI0, loop first
over all DL config Req/HI DCI0, and for each, match UE.  Lowers CPU
traffic for high traffic situations.

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